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nestedHilbertScheme -- computes a nested Hilbert scheme of a pair

Description

F0X and F0Y are matrices over a common ring and respectively encode equations a subscheme/quotient module and its ambient scheme/module.

If SanityCheck is set to true, as is the default, then the algorithm will check that the relevant deformation equations are satisfied, and terminate with an error if this is not the case.

The parameters used in the perturbations may be specified by the options DefParamX and DefParamY.

For example, consider the cone over the rational normal curve of degree four and a fat point at the origin cut out by the square of the homogeneous maximal ideal. The following computes the nested Hilbert scheme of this pair:

i1 : R=QQ[x,y];
i2 : F0Y=basis(3,R);

             1      4
o2 : Matrix R  <-- R
i3 : F0X=basis(2,R);

             1      3
o3 : Matrix R  <-- R
i4 : D=nestedHilbertScheme(F0X,F0Y,Verbose=>4);
Calculating first order relations
Calculating standard expressions for obstructions
Starting lifting
Order 2
Lifting family for X
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Lifting family for Y
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Calculating tangent cone for new obstructions
Calculating joint residual terms
Calculating Joint Obstruction Equations
Changing Families
Changing Relations
Lifting Submodule Relation
Correcting Coefficients
Doing Sanity Check
Checking polynomial lifting
Order 3
Lifting family for X
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Lifting family for Y
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Calculating tangent cone for new obstructions
Calculating joint residual terms
Calculating Joint Obstruction Equations
Changing Families
Changing Relations
Lifting Submodule Relation
Correcting Coefficients
Doing Sanity Check
Checking polynomial lifting
Solution is polynomial
i5 : transpose (families D)_0

o5 = {-2} | t_2t_3-t_3^2-t_1t_4+t_1t_5+yt_1+xt_2+x2  |
     {-2} | t_3t_4-t_1t_6+yt_3+xt_4+xy               |
     {-2} | -t_4^2+t_4t_5+t_2t_6-t_3t_6+yt_5+xt_6+y2 |

                        3                 1
o5 : Matrix (R[t ..t  ])  <-- (R[t ..t  ])
                1   18            1   18
i6 : transpose (families D)_1

o6 = {-3} | t_9t_11t_13-t_11^2t_13-t_8t_12t_13+t_10t_12t_13-t_9t_13^2+t
     {-3} | t_11t_12t_13-t_12t_13^2-t_10t_12t_14-t_8t_13t_15+t_10t_13t_
     {-3} | -t_12^2t_13+t_12t_13t_14+t_10t_12t_15+t_9t_13t_15-t_11t_13t
     {-3} | t_12^2t_14-t_12t_14^2-t_11t_12t_15+t_12t_13t_15-t_9t_14t_15
     ------------------------------------------------------------------------
     _11t_13^2-t_9t_10t_14+t_10t_11t_14+t_7t_12t_14+t_8t_13t_14-t_10t_13t_14-
     15+t_7t_14t_15+t_10t_12t_16-t_7t_15t_16+t_8t_10t_18-t_10^2t_18-t_7t_11t_
     _15-t_7t_15^2-t_10t_12t_17+t_7t_15t_17-t_9t_10t_18+t_10t_11t_18+t_7t_12t
     +t_11t_14t_15+t_8t_15^2-t_10t_15^2-t_12^2t_16+t_12t_14t_16+t_9t_15t_16-t
     ------------------------------------------------------------------------
     t_7t_14^2+t_8t_10t_15-t_10^2t_15-t_7t_11t_15+t_7t_13t_15+t_9t_10t
     18+t_7t_13t_18+yt_10t_12+xt_11t_12+yt_11t_13-yt_13^2-yt_10t_14-yt
     _18-t_7t_14t_18-xt_12^2+xt_12t_14+yt_13t_14+xt_9t_15+yt_10t_15-xt
     _11t_15t_16+t_11t_12t_17-t_12t_13t_17-t_8t_15t_17+t_10t_15t_17+t_
     ------------------------------------------------------------------------
     _16-t_10t_11t_16-t_7t_12t_16+t_7t_14t_16-t_8t_10t_17+t_10^2t_17+t_7t_11t
     _7t_15-xt_8t_15+xt_10t_15+yt_10t_16-xt_7t_18+y2t_10+xyt_11+x2t_12+x2y   
     _11t_15+xt_13t_15-yt_10t_17-yt_7t_18-xt_10t_18+y2t_13+xyt_14+x2t_15+xy2 
     9t_11t_18-t_11^2t_18-t_8t_12t_18+t_10t_12t_18-t_9t_13t_18+t_11t_13t_18+t
     ------------------------------------------------------------------------
     _17-t_7t_13t_17+yt_9t_10+xt_9t_11-yt_10t_11-xt_11^2-yt_7t_12-xt_8t_12+xt
                                                                             
                                                                             
     _8t_14t_18-t_10t_14t_18-yt_12^2+yt_12t_14-yt_14^2+yt_9t_15-2yt_11t_15-xt
     ------------------------------------------------------------------------
     _10t_12+yt_8t_13-yt_10t_13+xt_11t_13-xt_13^2+xt_8t_14-2xt_10t_14-xt_7t_
                                                                            
                                                                            
     _12t_15+yt_13t_15-xt_14t_15+yt_14t_16+xt_15t_16+yt_11t_17+xt_12t_17-yt_
     ------------------------------------------------------------------------
     15+yt_7t_16+xt_10t_16+xt_7t_17+y2t_7+xyt_8+x2t_9+x3                  |
                                                                          |
                                                                          |
     13t_17+yt_8t_18+xt_9t_18-yt_10t_18-xt_13t_18+y2t_16+xyt_17+x2t_18+y3 |

                        4                 1
o6 : Matrix (R[t ..t  ])  <-- (R[t ..t  ])
                1   18            1   18
i7 : obstructions D

o7 = | 0                                                        
     | 0                                                        
     | 0                                                        
     | 0                                                        
     | t_1t_2+t_1t_3-t_5t_7-t_3t_8-t_1t_9+t_9t_10-t_10t_11-t_7t_
     | t_2^2-t_2t_3+t_3^2+2t_1t_4-t_1t_5-t_6t_7-t_4t_8-t_2t_9+t_
     | t_3^2+t_1t_4-t_5t_10-t_3t_11-t_1t_12+t_10t_12+t_11t_13-t_
     | t_2t_4+t_1t_6-t_6t_10-t_4t_11-t_2t_12+t_11t_12-t_8t_15+t_
     | t_3t_5+t_1t_6-t_5t_13-t_3t_14+t_13t_14-t_1t_15+t_10t_15-t
     | t_4^2+t_3t_6-t_12^2-t_6t_13-t_4t_14+t_12t_14-t_2t_15+t_9t
     | t_4^2-t_4t_5+t_5^2-t_2t_6+2t_3t_6-t_12^2+t_12t_14-t_14^2+
     | t_4t_6+t_5t_6-t_12t_15-t_14t_15-t_6t_16+t_15t_16-t_4t_17+
     ------------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
     12+t_8t_13-t_10t_13+t_7t_16                                             
     9t_11-t_11^2-t_8t_12+t_10t_12+t_11t_13-t_13^2+t_8t_14-2t_10t_14-t_7t_15+
     13^2-t_10t_14-t_7t_15+t_10t_16                                          
     10t_15-t_7t_18                                                          
     _10t_17-t_7t_18                                                         
     _15-t_11t_15+t_13t_15-t_10t_18                                          
     t_9t_15-2t_11t_15+t_13t_15-t_5t_16+t_14t_16-t_3t_17+t_11t_17-t_13t_17-t_
     t_12t_17-t_2t_18+t_9t_18-t_13t_18                                       
     ------------------------------------------------------------------------
                            |
                            |
                            |
                            |
                            |
     t_10t_16+t_7t_17       |
                            |
                            |
                            |
                            |
     1t_18+t_8t_18-t_10t_18 |
                            |

                        12                 1
o7 : Matrix (R[t ..t  ])   <-- (R[t ..t  ])
                1   18             1   18

If Projective is set to true then only degree zero deformations are considered; under favorable circumstances this will give the nested Hilbert/Quot scheme of the associated projective schemes or coherent sheaves.

For instance, consider the nested Hilbert scheme of a line on a singular cubic surface:

i8 : R=QQ[x_0..x_3];
warning: clearing value of symbol x to allow access to subscripted variables based on it
       : debug with expression   debug 9868   or with command line option   --debug 9868
i9 : F0Y=gens ideal {x_1*x_2*x_3-x_0^3};

             1      1
o9 : Matrix R  <-- R
i10 : F0X=gens ideal {x_1,x_0};

              1      2
o10 : Matrix R  <-- R
i11 : D=nestedHilbertScheme(F0X,F0Y,Verbose=>4,Projective=>true);
Calculating first order relations
Calculating standard expressions for obstructions
Starting lifting
Order 2
Lifting family for X
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Lifting family for Y
Calculating tangent cone for new obstructions
Calculating joint residual terms
Calculating Joint Obstruction Equations
Changing Families
Changing Relations
Lifting Submodule Relation
Correcting Coefficients
Doing Sanity Check
Checking polynomial lifting
Solution is polynomial
i12 : transpose (families D)_0

o12 = {-1} | x_0t_16+x_1t_17+x_2t_18+x_3t_19+x_1 |
      {-1} | x_2t_14+x_3t_15+x_0                 |

                         2                 1
o12 : Matrix (R[t ..t  ])  <-- (R[t ..t  ])
                 1   19            1   19
i13 : transpose (families D)_1

o13 = {-3} | x_0x_2^2t_7t_14+x_0x_2x_3t_8t_14+x_1^2x_2t_9t_14+x_1x_2^2t_10t_
      -----------------------------------------------------------------------
      14+x_1x_2x_3t_11t_14+x_2^3t_12t_14+x_2x_3^2t_13t_14+x_0x_2^2t_14^2+x_0x
      -----------------------------------------------------------------------
      _2x_3t_7t_15+x_0x_3^2t_8t_15+x_1^2x_3t_9t_15+x_1x_2x_3t_10t_15+x_1x_3^
      -----------------------------------------------------------------------
      2t_11t_15+x_2^2x_3t_12t_15+x_3^3t_13t_15+2x_0x_2x_3t_14t_15+x_0x_3^2t_
      -----------------------------------------------------------------------
      15^2+x_0x_1^2t_1t_16+x_0x_1x_2t_2t_16+x_0x_1x_3t_3t_16+x_0x_2^2t_4t_16+
      -----------------------------------------------------------------------
      x_0x_3^2t_5t_16+x_0^3t_6t_16+x_1^3t_1t_17+x_1^2x_2t_2t_17+x_1^2x_3t_3t_
      -----------------------------------------------------------------------
      17+x_1x_2^2t_4t_17+x_1x_3^2t_5t_17+x_0^2x_1t_6t_17+x_1^2x_2t_1t_18+x_1x
      -----------------------------------------------------------------------
      _2^2t_2t_18+x_1x_2x_3t_3t_18+x_2^3t_4t_18+x_2x_3^2t_5t_18+x_0^2x_2t_6t_
      -----------------------------------------------------------------------
      18+x_1^2x_3t_1t_19+x_1x_2x_3t_2t_19+x_1x_3^2t_3t_19+x_2^2x_3t_4t_19+x_3
      -----------------------------------------------------------------------
      ^3t_5t_19+x_0^2x_3t_6t_19+x_1^3t_1+x_1^2x_2t_2+x_1^2x_3t_3+x_1x_2^2t_4+
      -----------------------------------------------------------------------
      x_1x_3^2t_5+x_0^2x_1t_6+x_0^2x_2t_7+x_0^2x_3t_8+x_0x_1^2t_9+x_0x_1x_2t_
      -----------------------------------------------------------------------
      10+x_0x_1x_3t_11+x_0x_2^2t_12+x_0x_3^2t_13+x_0x_2x_3t_16+x_1x_2x_3t_17+
      -----------------------------------------------------------------------
      x_2^2x_3t_18+x_2x_3^2t_19-x_0^3+x_1x_2x_3 |

                         1                 1
o13 : Matrix (R[t ..t  ])  <-- (R[t ..t  ])
                 1   19            1   19
i14 : obstructions D

o14 = 0

                               1
o14 : Matrix 0 <-- (R[t ..t  ])
                       1   19

Here is an example of a 4th order approximation of a nested Quot scheme:

i15 : R=QQ[x,y];
i16 : F0X=matrix {{x,y,0,0},{0,0,x,y}};

              2      4
o16 : Matrix R  <-- R
i17 : F0Y=matrix {{x^2,y^2,0,0,x*y},{0,0,x^2,y^2,0}};

              2      5
o17 : Matrix R  <-- R
i18 : D=nestedHilbertScheme(F0X,F0Y,Verbose=>4,HighestOrder=>4,DegreeBound=>1);
Calculating first order relations
Calculating standard expressions for obstructions
Starting lifting
Order 2
Lifting family for X
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Lifting family for Y
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Calculating tangent cone for new obstructions
Calculating joint residual terms
Calculating Joint Obstruction Equations
Changing Families
Changing Relations
Lifting Submodule Relation
Correcting Coefficients
Doing Sanity Check
Checking polynomial lifting
Order 3
Lifting family for X
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Lifting family for Y
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Calculating tangent cone for new obstructions
Calculating joint residual terms
Calculating Joint Obstruction Equations
Changing Families
Changing Relations
Lifting Submodule Relation
Correcting Coefficients
Doing Sanity Check
Checking polynomial lifting
Order 4
Lifting family for X
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Lifting family for Y
Calculating tangent cone for obstructions
Calculating residual terms
Lifting Family
Calculating Obstruction Equations
Lifting Relations and Coefficients
Calculating tangent cone for new obstructions
Calculating joint residual terms
Calculating Joint Obstruction Equations
Changing Families
Changing Relations
Lifting Submodule Relation
Correcting Coefficients
Doing Sanity Check
Checking polynomial lifting
Warning: calculation terminated since HighestOrder has been reached.
i19 : transpose (families D)_0

o19 = {-1} | t_1+x t_7t_18t_29^2-t_13^2t_17t_31+2t_6t_13t_18t_31-t_12t_13t_
      {-1} | t_3+y t_4                                                     
      {-1} | t_5   t_6+x                                                   
      {-1} | t_7   t_8+y                                                   
      -----------------------------------------------------------------------
      18t_31+t_5t_13t_25t_31-t_13t_15t_29t_31-t_10t_18t_29t_31-t_13t_14t_31^2
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      -t_9t_18t_31^2+t_6t_18t_29-t_18t_20t_29+t_5t_25t_29+t_18t_26t_29+t_13t_
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      16t_31+t_11t_18t_31-t_18t_19t_31+t_9t_25t_31-t_7t_29t_31-t_5t_31^2+t_
                                                                           
                                                                           
                                                                           
      -----------------------------------------------------------------------
      10t_31^2+t_18t_21+t_19t_25+t_8t_29-t_27t_29-t_13t_30+t_6t_31-t_12t_31+t
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      _20t_31-t_26t_31+t_2 |
                           |
                           |
                           |

                         4                 2
o19 : Matrix (R[t ..t  ])  <-- (R[t ..t  ])
                 1   31            1   31
i20 : transpose (families D)_1

o20 = {-2} | t_5t_6t_18t_29-t_5t_18t_20t_29+t_5^2t_25t_29+t_5t_18t_26t_29-t
      {-2} | t_3t_7t_13t_25+t_7t_8t_13t_25-t_3t_13t_14t_25-t_1t_13t_15t_25-
      {-2} | -t_1t_5-t_5t_6+t_3t_9+t_1t_10+t_7t_11+t_5t_12+yt_5t_13+yt_9+xt
      {-2} | -t_3t_7-t_7t_8+t_3t_14+t_1t_15+t_7t_16+t_5t_17+yt_5t_18+yt_14+
      {-2} | -t_7t_15t_29^2+t_3t_7t_13t_31+t_7t_8t_13t_31-t_3t_13t_14t_31-t
      -----------------------------------------------------------------------
      _7^2t_29^2+t_7t_14t_29^2+t_6t_13t_14t_31-t_9t_13t_17t_31+t_5t_11t
      t_6t_13t_15t_25-t_7t_13t_16t_25-t_5t_13t_17t_25+t_10t_13t_17t_25+
      _10                                                              
      xt_15                                                            
      _1t_13t_15t_31-t_6t_13t_15t_31-t_7t_13t_16t_31-t_5t_13t_17t_31+t_
      -----------------------------------------------------------------------
      _18t_31-t_13t_15t_19t_31-t_5t_18t_19t_31+t_5t_13t_22t_31+t_5t_9t_
      t_13t_15t_20t_25-t_5t_13t_23t_25+t_13t_14t_25t_27-t_3t_7t_18t_29-
                                                                       
                                                                       
      10t_13t_17t_31+t_13t_15t_20t_31-t_5t_13t_23t_31+t_13t_14t_27t_31+
      -----------------------------------------------------------------------
      25t_31-t_13t_14t_26t_31-t_5t_7t_29t_31+t_7t_10t_29t_31-t_10t_14t_29t
      t_7t_8t_18t_29+t_3t_14t_18t_29+t_1t_15t_18t_29+t_6t_15t_18t_29+t_7t_
                                                                          
                                                                          
      t_10t_15t_29t_31+t_9t_15t_31^2-t_6t_15t_29+t_15t_20t_29-t_5t_23t_29-
      -----------------------------------------------------------------------
      _31-t_5^2t_31^2+t_7t_9t_31^2+t_5t_10t_31^2-t_9t_14t_31^2+t_5t_18t
      16t_18t_29+t_5t_17t_18t_29-t_10t_17t_18t_29-t_15t_18t_20t_29+t_5t
                                                                       
                                                                       
      t_15t_26t_29+t_7t_27t_29-t_11t_15t_31+t_15t_19t_31-t_9t_23t_31+t_
      -----------------------------------------------------------------------
      _21+t_5t_19t_25+t_6t_14t_29+t_7t_20t_29-t_14t_20t_29+t_5t_22t_29-2t_7t
      _18t_23t_29-t_5t_15t_25t_29+t_10t_15t_25t_29-t_14t_18t_27t_29-t_15^2t_
                                                                            
                                                                            
      5t_27t_31-t_10t_27t_31-t_15t_21-t_19t_23+t_26t_27+yt_7t_29+t_10t_30+yt
      -----------------------------------------------------------------------
      _26t_29+t_14t_26t_29-t_5t_27t_29-t_5t_13t_30+t_1t_5t_31+t_5t_6t_31-t_
      29^2+t_9t_15t_25t_31-t_14t_15t_29t_31+t_5t_15t_31^2-t_11t_15t_25-t_9t
                                                                           
                                                                           
      _5t_31+yt_26+xt_27+xy                                                
      -----------------------------------------------------------------------
      3t_9t_31-t_1t_10t_31-t_7t_11t_31-t_5t_12t_31+t_11t_14t_31+t_7t_19t_31-t
      _23t_25+t_5t_25t_27-t_10t_25t_27-t_8t_15t_29+t_15t_16t_29-t_15t_22t_29-
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      _14t_19t_31+t_5t_20t_31+t_9t_22t_31-2t_5t_26t_31+t_10t_26t_31+t_14t_
      t_7t_23t_29+t_14t_23t_29+2t_15t_27t_29-t_6t_15t_31-t_5t_23t_31+t_15t
                                                                          
                                                                          
                                                                          
      -----------------------------------------------------------------------
      21+t_19t_22+t_20t_26-t_26^2-t_19t_27+yt_5t_29-t_9t_30+yt_19+xt_20+x2   
      _26t_31+t_7t_27t_31+t_20t_23+t_10t_24+yt_5t_25-t_23t_26+t_22t_27-t_27^2
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                       
      -t_15t_28+yt_7t_31+yt_22+xt_23+y2
                                       
                                       
                                       
      -----------------------------------------------------------------------
      -t_13t_16t_19t_25-t_11t_18t_19t_25-t_9t_19t_25^2+t_6^2t_18t_29-t_
      t_4t_7t_13t_25+t_8^2t_13t_25-t_4t_13t_14t_25-t_2t_13t_15t_25-t_8t
      -t_5t_6t_18t_29+t_6t_10t_18t_29+t_5t_18t_20t_29-t_10t_18t_20t_29-
      t_5t_13t_18t_24-t_1t_5t_18t_25-t_5t_6t_18t_25+t_3t_9t_18t_25+t_1t
      t_6t_18t_27t_29-t_18t_20t_27t_29+t_5t_25t_27t_29+t_18t_26t_27t_29
      -----------------------------------------------------------------------
      8t_18t_19t_29+2t_16t_18t_19t_29-t_6t_18t_20t_29-t_18t_19t_22t_29+
      _13t_16t_25-2t_6t_13t_17t_25+t_12t_13t_17t_25+yt_13^2t_17t_25-2yt
      t_5^2t_25t_29+t_5t_10t_25t_29-t_5t_18t_26t_29+t_10t_18t_26t_29-t_
      _10t_18t_25+t_7t_11t_18t_25+t_5t_12t_18t_25-t_11t_14t_18t_25-t_9t
      -t_7t_17t_29^2+t_4t_7t_13t_31+t_8^2t_13t_31-t_4t_13t_14t_31-t_2t_
      -----------------------------------------------------------------------
      t_5t_13t_24t_29+t_5t_12t_25t_29-t_7t_19t_25t_29+t_14t_19t_25t_29+t_6t
      _6t_13t_18t_25+yt_12t_13t_18t_25-t_5t_13t_24t_25-yt_5t_13t_25^2+t_13t
      5t_13t_16t_31+t_10t_13t_16t_31-t_5t_11t_18t_31+t_10t_11t_18t_31+t_5t_
      _18t_22t_25-t_10t_18t_25t_26-t_5t_18^2t_28+t_3t_7t_18t_29+t_7t_8t_18t
      13t_15t_31-t_8t_13t_16t_31-2t_6t_13t_17t_31+t_12t_13t_17t_31-t_5t_13t
      -----------------------------------------------------------------------
      _18t_26t_29-t_5t_25t_26t_29+t_18t_19t_27t_29-t_5t_18t_28t_29-
      _15t_25t_28-t_4t_7t_18t_29-t_8^2t_18t_29+t_4t_14t_18t_29+t_2t
      18t_19t_31-t_10t_18t_19t_31-t_5t_9t_25t_31+t_9t_10t_25t_31+t_
      _29-t_3t_14t_18t_29-t_8t_14t_18t_29-t_1t_15t_18t_29-t_7t_16t_
      _24t_31+t_13t_16t_27t_31+t_11t_18t_27t_31-t_18t_19t_27t_31+t_
      -----------------------------------------------------------------------
      t_7t_8t_29^2+t_7t_16t_29^2-t_5t_17t_29^2+xt_7t_18t_29^2+t_5t_23t_29^2
      _15t_18t_29+t_8t_16t_18t_29+2t_6t_17t_18t_29-t_12t_17t_18t_29-yt_13t_
      5t_7t_29t_31-t_7t_10t_29t_31+t_5^2t_31^2-2t_5t_10t_31^2+t_10^2t_31^2-
      18t_29+t_14t_16t_18t_29-t_5t_17t_18t_29+t_5t_15t_25t_29+t_15t_18t_26t
      9t_25t_27t_31+t_13t_15t_28t_31+t_10t_17t_29t_31-t_7t_27t_29t_31+t_13t
      -----------------------------------------------------------------------
      +t_6t_13t_16t_31-t_11t_13t_17t_31-xt_13^2t_17t_31+t_6t_11t_18t_31+2xt
      17t_18t_29+2yt_6t_18^2t_29-yt_12t_18^2t_29+t_6t_18t_23t_29-t_18t_20t_
      t_5t_18t_21+t_10t_18t_21-t_5t_19t_25+t_10t_19t_25-t_5t_8t_29+t_8t_10t
      _29+t_14t_18t_27t_29+t_13t_15t_16t_31-t_6t_14t_18t_31-t_9t_18t_23t_31
      _14t_30t_31+t_9t_17t_31^2-t_5t_27t_31^2+t_10t_27t_31^2+t_18t_21t_27+t
      -----------------------------------------------------------------------
      _6t_13t_18t_31-xt_12t_13t_18t_31-2t_6t_18t_19t_31+t_5t_18t_21t_31-t
      23t_29+t_5t_18t_24t_29+yt_13t_15t_25t_29-t_5t_17t_25t_29+t_10t_17t_
      _29+t_5t_27t_29-t_10t_27t_29+t_5t_13t_30-t_10t_13t_30-t_5t_6t_31+t_
      +t_9t_15t_25t_31+t_14t_18t_26t_31-t_10t_18t_27t_31-t_7t_15t_29t_31-
      _19t_25t_27-t_6t_17t_29+t_17t_20t_29-t_5t_24t_29-t_17t_26t_29+t_8t_
      -----------------------------------------------------------------------
      _10t_18t_21t_31+t_9t_12t_25t_31+xt_5t_13t_25t_31+t_5t_19t_25t_31-2t_10t
      25t_29+yt_10t_18t_25t_29+t_5t_23t_25t_29+t_18t_23t_26t_29-t_15t_18t_28t
      6t_10t_31+t_5t_12t_31-t_10t_12t_31-t_5t_20t_31+t_10t_20t_31+t_5t_26t_31
      t_5t_15t_31^2+t_10t_15t_31^2+t_9t_18t_24+t_15t_19t_25-t_14t_18t_28+t_8t
      27t_29-t_27^2t_29-t_13t_27t_30+t_7t_29t_30-t_11t_17t_31+t_17t_19t_31-t_
      -----------------------------------------------------------------------
      _19t_25t_31+t_18t_19t_26t_31-t_9t_25t_26t_31-t_9t_18t_28t_31-t_6t_7t_
      _29-t_15t_17t_29^2-2yt_15t_18t_29^2+t_13t_14t_25t_30-t_14t_18t_29t_30
      -t_10t_26t_31-t_2t_5-t_6^2+t_4t_9+t_2t_10+t_8t_11+t_6t_12+yt_6t_13+yt
      _15t_29-t_15t_27t_29-t_13t_15t_30+t_10t_18t_30+t_6t_15t_31-t_12t_15t_
      9t_24t_31+t_6t_27t_31-t_12t_27t_31+t_20t_27t_31-t_26t_27t_31+t_5t_30t
      -----------------------------------------------------------------------
      29t_31-xt_13t_15t_29t_31-t_10t_16t_29t_31-t_9t_17t_29t_31-
      +t_13t_16t_23t_31+t_11t_18t_23t_31-t_18t_19t_23t_31+yt_13t
      _11+xt_12+xyt_13+x2                                       
      31+t_15t_20t_31-t_15t_26t_31-t_4t_7-t_8^2+t_4t_14+t_2t_15+
      _31-t_10t_30t_31-t_17t_21-t_19t_24+t_27t_28+yt_8t_29+t_12t
      -----------------------------------------------------------------------
      xt_10t_18t_29t_31+t_15t_19t_29t_31+t_5t_22t_29t_31+t_9t_23t_29t_31-2t_
      _14t_25t_31+t_9t_17t_25t_31+yt_9t_18t_25t_31+t_9t_23t_25t_31-t_14t_17t
                                                                            
      t_8t_16+t_6t_17+yt_6t_18+yt_16+xt_17+xyt_18+y2                        
      _30-t_20t_30+t_26t_30+yt_6t_31+yt_28+y2t_29+xt_30+xyt_31              
      -----------------------------------------------------------------------
      5t_27t_29t_31+t_10t_27t_29t_31-t_5t_12t_31^2+t_10t_12t_31^2-xt_13t_14t_
      _29t_31-2yt_14t_18t_29t_31-t_7t_23t_29t_31+t_5t_17t_31^2+yt_5t_18t_31^2
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      31^2-t_9t_16t_31^2-xt_9t_18t_31^2+t_7t_19t_31^2+t_5t_20t_31^2-t_10t
      -t_5t_23t_31^2+t_10t_23t_31^2+t_18t_21t_23-yt_13t_16t_25-t_11t_17t_
                                                                         
                                                                         
                                                                         
      -----------------------------------------------------------------------
      _20t_31^2+t_9t_22t_31^2-t_5t_26t_31^2+t_10t_26t_31^2-t_9t_27t_31^2+t_6t
      25-yt_11t_18t_25+t_19t_23t_25-t_9t_24t_25-yt_9t_25^2-t_8t_17t_29+t_16t_
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      _18t_21+t_13t_19t_24+t_12t_19t_25-t_19t_25t_26-t_18t_19t_28+t_6t_16t_29
      17t_29-yt_8t_18t_29+2yt_16t_18t_29-t_17t_22t_29-yt_18t_22t_29+t_8t_23t_
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      +xt_6t_18t_29-t_17t_19t_29+t_8t_20t_29-t_16t_20t_29-xt_18t_20t_29+t_19t
      29-t_7t_24t_29+t_14t_24t_29-yt_7t_25t_29+yt_14t_25t_29+t_17t_27t_29+yt_
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      _23t_29+xt_5t_25t_29-t_8t_26t_29+t_16t_26t_29+xt_18t_26t_29-t_6t_27t_29
      18t_27t_29-t_23t_27t_29-t_13t_23t_30+t_5t_25t_30-t_10t_25t_30+t_15t_29t
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      -t_7t_28t_29-t_6t_13t_30+t_5t_29t_30+t_2t_5t_31+t_6^2t_31-t_4t_9t_31-t_
      _30-t_6t_17t_31-yt_6t_18t_31+t_6t_23t_31-t_12t_23t_31+t_20t_23t_31-t_5t
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      2t_10t_31-t_8t_11t_31-t_6t_12t_31+t_11t_16t_31+xt_13t_16t_31+xt_11t_
      _24t_31-yt_10t_25t_31+t_17t_26t_31+yt_18t_26t_31-t_23t_26t_31+yt_15t
                                                                          
                                                                          
                                                                          
      -----------------------------------------------------------------------
      18t_31-t_16t_19t_31-xt_18t_19t_31+t_6t_20t_31+t_19t_22t_31+xt_9t_25t_31
      _29t_31+t_7t_30t_31+yt_7t_31^2+t_12t_24+yt_13t_24+yt_12t_25-t_24t_26-yt
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      -t_6t_26t_31-t_19t_27t_31-t_5t_28t_31+t_10t_28t_31-xt_7t_29t_31+t_
      _25t_26-t_17t_28-yt_18t_28+t_23t_28-yt_17t_29+yt_23t_29+t_22t_30-t
                                                                        
                                                                        
                                                                        
      -----------------------------------------------------------------------
      9t_30t_31-xt_5t_31^2+xt_10t_31^2+t_16t_21+xt_18t_21+xt_19t_25-t_21t_27+
      _27t_30+yt_22t_31-yt_27t_31+xt_24+xyt_25+yt_30+y2t_31                  
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      t_20t_28-t_26t_28+yt_6t_29+xt_8t_29-xt_27t_29-t_11t_30-xt_13t_30+t_19t_
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
      30+xt_6t_31-xt_12t_31+xt_20t_31-xt_26t_31+yt_21+xt_28+xyt_29 |
                                                                   |
                                                                   |
                                                                   |
                                                                   |

                         5                 2
o20 : Matrix (R[t ..t  ])  <-- (R[t ..t  ])
                 1   31            1   31
i21 : obstructions D

o21 = | -t_6t_7t_18t_29+t_7t_18t_20t_29-t_5t_7t_25t_29-t_7t_18t_26t_29-t_7t_1
      | t_3t_6t_18t_29-t_6t_8t_18t_29-t_3t_18t_20t_29+t_8t_18t_20t_29+t_1t_7t
      | -t_3t_5+t_1t_7-t_6t_7+t_5t_8                                         
      | t_6t_7t_18t_29-t_7t_18t_20t_29+t_5t_7t_25t_29+t_7t_18t_26t_29+t_7t_13
      | 0                                                                    
      | -t_6t_13t_14t_25+t_9t_13t_17t_25-t_5t_11t_18t_25+t_13t_15t_19t_25-t_5
      | 0                                                                    
      | -t_6t_13t_16t_25+t_11t_13t_17t_25-t_6t_11t_18t_25-t_5t_18t_21t_25+t_1
      | 0                                                                    
      | 0                                                                    
      | 0                                                                    
      | t_6t_13t_14t_23-t_5t_13t_16t_23-t_6t_9t_18t_23+t_5t_11t_18t_23-t_13t_
      | -t_2t_7^2t_13+t_1t_7t_8t_13-t_3t_6t_13t_14+t_2t_7t_13t_14+t_2t_5t_13t
      | 0                                                                    
      | 0                                                                    
      | t_6t_13t_14t_25-t_9t_13t_17t_25+t_5t_11t_18t_25-t_13t_15t_19t_25+t_5t
      | 0                                                                    
      | t_5t_6t_18t_29-t_5t_18t_20t_29+t_5^2t_25t_29+t_5t_18t_26t_29-t_7^2t_2
      | -t_13t_16t_19t_25-t_11t_18t_19t_25-t_9t_19t_25^2+t_1t_6t_18t_29+t_6^2
      | t_3t_7t_13t_25+t_7t_8t_13t_25-t_3t_13t_14t_25-t_1t_13t_15t_25-t_6t_13
      | t_4t_7t_13t_25+t_8^2t_13t_25-t_4t_13t_14t_25-t_2t_13t_15t_25-2t_6t_13
      | t_6t_13t_14t_25-t_9t_13t_17t_25+t_5t_11t_18t_25-t_13t_15t_19t_25+t_5t
      | t_6t_13t_16t_25-t_11t_13t_17t_25+t_6t_11t_18t_25+t_5t_18t_21t_25-t_10
      -----------------------------------------------------------------------
      3t_16t_31-t_7t_11t_18t_31+t
      _25t_29-t_6t_7t_25t_29+t_3t
                                 
      t_16t_31+t_7t_11t_18t_31-t_
                                 
      t_13t_22t_25-t_5t_9t_25^2+t
                                 
      0t_18t_21t_25-t_9t_12t_25^2
                                 
                                 
                                 
      15t_19t_23-t_5t_18t_19t_23+
      _15-t_1t_6t_13t_15-t_6t_7t_
                                 
                                 
      _13t_22t_25+t_5t_9t_25^2-t_
                                 
      9^2+t_7t_14t_29^2+t_6t_13t_
      t_18t_29-t_8t_18t_19t_29+2t
      t_15t_25-t_5t_13t_17t_25+t_
      t_17t_25+t_12t_13t_17t_25+t
      _13t_22t_25+t_5t_9t_25^2-t_
      t_18t_21t_25+t_9t_12t_25^2+
      -----------------------------------------------------------------------
      _7t_18t_19t_31-t_7t_9t_25t_31+t_7^2t_29t_31+t_5t_7t_31^2-t_7t_10t_31^2-
      _18t_26t_29-t_8t_18t_26t_29+t_3t_13t_16t_31-t_8t_13t_16t_31+t_3t_11t_18
                                                                             
      7t_18t_19t_31+t_7t_9t_25t_31-t_7^2t_29t_31-t_5t_7t_31^2+t_7t_10t_31^2+t
                                                                             
      _13t_14t_25t_26-t_5t_8t_18t_29+t_6t_14t_18t_29+t_5t_16t_18t_29-t_9t_17t
                                                                             
      -t_5t_19t_25^2+t_10t_19t_25^2+t_13t_16t_25t_26+t_11t_18t_25t_26+2t_9t_2
                                                                             
                                                                             
                                                                             
      t_10t_18t_19t_23+t_5t_13t_22t_23+t_5t_9t_18t_24-t_3t_7t_9t_25-t_7t_8t_9
      13t_16+t_5t_8t_13t_16+t_2t_5^2t_18-t_1t_5t_6t_18+t_3t_6t_9t_18-t_2t_7t_
                                                                             
                                                                             
      13t_14t_25t_26+t_5t_8t_18t_29-t_6t_14t_18t_29-t_5t_16t_18t_29+t_9t_17t_
                                                                             
      14t_31-t_9t_13t_17t_31+t_5t_11t_18t_31-t_13t_15t_19t_31-t_5t_18t_19t_31
      _16t_18t_19t_29-t_1t_18t_20t_29-2t_6t_18t_20t_29+t_18t_20^2t_29-t_18t_1
      10t_13t_17t_25+t_7t_11t_18t_25+t_13t_15t_20t_25-t_5t_13t_23t_25+t_7t_9t
      _8t_11t_18t_25-t_5t_13t_24t_25+t_8t_9t_25^2+t_13t_15t_25t_28-t_4t_7t_18
      13t_14t_25t_26+t_6t_7t_18t_29+t_5t_8t_18t_29-t_6t_14t_18t_29-t_5t_16t_1
      t_5t_19t_25^2-t_10t_19t_25^2-t_13t_16t_25t_26-t_11t_18t_25t_26-2t_9t_25
      -----------------------------------------------------------------------
      t_7t_18t_21-t_7t_19t_25-t_7t_8t_29+t_7t_27t_29+t_7t_13t_30-t_6t_7t_31+t
      t_31-t_8t_11t_18t_31-t_3t_18t_19t_31+t_8t_18t_19t_31+t_3t_9t_25t_31-t_8
                                                                             
      _7t_18t_21+t_7t_19t_25+t_7t_8t_29-t_7t_27t_29-t_7t_13t_30+t_6t_7t_31-t_
                                                                             
      _18t_29-t_15t_18t_19t_29-t_7t_10t_25t_29+t_10t_14t_25t_29-t_14t_18t_26t
                                                                             
      5^2t_26+t_9t_18t_25t_28-t_6t_8t_18t_29+2t_6t_16t_18t_29-t_11t_17t_18t_2
                                                                             
                                                                             
                                                                             
      t_25+t_3t_9t_14t_25+t_1t_9t_15t_25+t_9t_12t_15t_25+t_7t_9t_16t_25+t_5t_
      9t_18-t_2t_5t_10t_18+t_1t_6t_10t_18+t_6t_7t_11t_18-t_5t_8t_11t_18+t_5t_
                                                                             
                                                                             
      18t_29+t_15t_18t_19t_29+t_7t_10t_25t_29-t_10t_14t_25t_29+t_14t_18t_26t_
                                                                             
      +t_5t_13t_22t_31+t_5t_9t_25t_31-t_13t_14t_26t_31-t_5t_7t_29t_31+t_7t_10
      9t_22t_29+t_5t_13t_24t_29+t_1t_5t_25t_29+t_5t_12t_25t_29-t_7t_19t_25t_2
      _25^2+t_13t_14t_25t_27-t_3t_7t_18t_29+t_3t_14t_18t_29+t_1t_15t_18t_29+t
      t_29+t_4t_14t_18t_29+t_2t_15t_18t_29-t_8t_16t_18t_29+2t_6t_17t_18t_29-t
      8t_29+t_9t_17t_18t_29+t_15t_18t_19t_29-t_7t_18t_20t_29+t_5t_7t_25t_29+t
      ^2t_26-t_9t_18t_25t_28+2t_6t_8t_18t_29-2t_6t_16t_18t_29+t_11t_17t_18t_2
      -----------------------------------------------------------------------
      _7t_12t_31-t_7t_20t_31+t_7t_26t_31+t_4t_5-t_2t_7                       
      t_9t_25t_31-t_3t_7t_29t_31+t_7t_8t_29t_31-t_1t_7t_31^2+t_6t_7t_31^2+t_3
                                                                             
      7t_12t_31+t_7t_20t_31-t_7t_26t_31-t_4t_5+t_2t_7                        
                                                                             
      _29+t_5t_18t_27t_29-t_14t_15t_29^2+t_3t_7t_13t_31+t_7t_8t_13t_31-t_3t_1
                                                                             
      9-t_6t_18t_22t_29-t_7t_13t_24t_29+t_13t_14t_24t_29-2t_9t_18t_24t_29-t_7
                                                                             
                                                                             
                                                                             
      9t_17t_25-t_9t_10t_17t_25+2t_5t_15t_19t_25-t_10t_15t_19t_25-t_9t_15t_20
      14t_18t_21-t_10t_14t_18t_21-t_1t_7t_13t_22+t_6t_7t_13t_22-t_5t_8t_13t_2
                                                                             
                                                                             
      29-t_5t_18t_27t_29+t_14t_15t_29^2-t_3t_7t_13t_31-t_7t_8t_13t_31+t_3t_13
                                                                             
      t_29t_31-t_10t_14t_29t_31-t_5^2t_31^2+t_7t_9t_31^2+t_5t_10t_31^2-t_9t_1
      9+t_14t_19t_25t_29-t_5t_20t_25t_29+t_1t_18t_26t_29+t_6t_18t_26t_29-t_18
      _6t_15t_18t_29-t_7t_16t_18t_29+t_5t_17t_18t_29-t_10t_17t_18t_29-t_15t_1
      _12t_17t_18t_29+t_8t_18t_22t_29+t_5t_18t_24t_29+t_7t_8t_25t_29-t_8t_14t
      _7t_10t_25t_29-t_10t_14t_25t_29+t_7t_18t_26t_29+t_14t_18t_26t_29-t_5t_1
      9-t_8t_18t_20t_29+t_6t_18t_22t_29+t_7t_13t_24t_29-t_13t_14t_24t_29+2t_9
      -----------------------------------------------------------------------
                                                                             
      t_10t_31^2-t_8t_10t_31^2+t_3t_18t_21-t_8t_18t_21+t_3t_19t_25-t_8t_19t_2
                                                                             
                                                                             
                                                                             
      3t_14t_31-t_1t_13t_15t_31-t_6t_13t_15t_31-t_7t_13t_16t_31-t_5t_13t_17t_
                                                                             
      t_12t_25t_29+t_12t_14t_25t_29-t_5t_16t_25t_29+t_10t_16t_25t_29+t_9t_17t
                                                                             
                                                                             
                                                                             
      t_25+t_5t_9t_23t_25-t_13t_14t_23t_26+t_9t_18t_23t_26-t_9t_15t_25t_26-t_
      2+t_6t_13t_14t_22-t_5t_13t_16t_22-t_6t_9t_18t_22+t_5t_11t_18t_22+t_5t_1
                                                                             
                                                                             
      t_14t_31+t_1t_13t_15t_31+t_6t_13t_15t_31+t_7t_13t_16t_31+t_5t_13t_17t_3
                                                                             
      4t_31^2+t_5t_18t_21+t_5t_19t_25+t_6t_14t_29+t_7t_20t_29-t_14t_20t_29+t_
      t_20t_26t_29-t_5t_25t_26t_29+t_18t_19t_27t_29-t_5t_18t_28t_29-t_7t_8t_2
      8t_20t_29+t_7t_18t_22t_29+t_5t_18t_23t_29+t_7^2t_25t_29-t_7t_14t_25t_29
      _25t_29-t_5t_17t_25t_29+t_10t_17t_25t_29-t_8t_18t_27t_29-t_15t_18t_28t_
      8t_27t_29-t_7t_15t_29^2+t_14t_15t_29^2+t_7t_13t_16t_31+t_5t_6t_18t_31+t
      t_18t_24t_29+t_5t_8t_25t_29+t_7t_12t_25t_29-t_12t_14t_25t_29+t_5t_16t_2
      -----------------------------------------------------------------------
                                                                      
      5+t_3t_8t_29-t_8^2t_29-t_3t_27t_29+t_8t_27t_29-t_3t_13t_30+t_8t_
                                                                      
                                                                      
                                                                      
      31+t_10t_13t_17t_31-t_5t_6t_18t_31+t_13t_15t_20t_31-t_5t_13t_23t
                                                                      
      _25t_29-t_15t_19t_25t_29-t_9t_23t_25t_29+t_8t_18t_26t_29-2t_16t_
                                                                      
                                                                      
                                                                      
      3t_7t_13t_27-t_7t_8t_13t_27+t_3t_13t_14t_27+t_1t_13t_15t_27+t_6t
      3t_22^2-t_1t_5t_13t_23+t_7t_13t_19t_23-t_13t_14t_19t_23+t_9t_18t
                                                                      
                                                                      
      1-t_10t_13t_17t_31+t_5t_6t_18t_31-t_13t_15t_20t_31+t_5t_13t_23t_
                                                                      
      5t_22t_29-2t_7t_26t_29+t_14t_26t_29-t_5t_27t_29-t_5t_13t_30+t_1t
      9^2+t_7t_16t_29^2-t_5t_17t_29^2+t_5t_23t_29^2+t_1t_13t_16t_31+t_
      -t_5t_15t_25t_29+t_10t_15t_25t_29-t_7t_18t_27t_29-t_14t_18t_27t_
      29-t_15t_17t_29^2+t_13t_14t_25t_30-t_14t_18t_29t_30+t_6t_8t_18t_
      _7t_11t_18t_31-t_7t_18t_19t_31+2t_7t_9t_25t_31+t_5t_10t_25t_31-t
      5t_29-t_10t_16t_25t_29-t_9t_17t_25t_29+t_15t_19t_25t_29+t_9t_23t
      -----------------------------------------------------------------------
                                                                             
      13t_30+t_3t_6t_31-t_6t_8t_31-t_3t_12t_31+t_8t_12t_31+t_3t_20t_31-t_8t_2
                                                                             
                                                                             
                                                                             
      _31-t_7t_9t_25t_31-t_5t_10t_25t_31+t_9t_14t_25t_31+t_5t_18t_26t_31+t_13
                                                                             
      18t_26t_29+t_18t_22t_26t_29+2t_7t_25t_26t_29-2t_14t_25t_26t_29+2t_6t_18
                                                                             
                                                                             
                                                                             
      _13t_15t_27+t_7t_13t_16t_27+t_1t_5t_18t_27+t_5t_6t_18t_27-t_3t_9t_18t_2
      _19t_23-t_5^2t_13t_24+t_7t_9t_13t_24+t_5t_10t_13t_24+t_9^2t_18t_24+t_1t
                                                                             
                                                                             
      31+t_7t_9t_25t_31+t_5t_10t_25t_31-t_9t_14t_25t_31-t_5t_18t_26t_31-t_13t
                                                                             
      _5t_31+t_5t_6t_31-t_3t_9t_31-t_1t_10t_31-t_7t_11t_31-t_5t_12t_31+t_11t_
      6t_13t_16t_31-t_11t_13t_17t_31+t_1t_11t_18t_31+t_6t_11t_18t_31-t_1t_18t
      29-t_15^2t_29^2+t_6t_7t_18t_31+t_7t_10t_25t_31+t_9t_15t_25t_31-t_7t_18t
      31+t_8t_10t_25t_31+t_9t_17t_25t_31-t_8t_18t_26t_31-t_8t_15t_29t_31-t_14
      _9t_14t_25t_31-t_5t_18t_26t_31-t_7^2t_29t_31-t_7t_14t_29t_31+t_14^2t_29
      _25t_29+2t_16t_18t_26t_29-t_18t_22t_26t_29-2t_7t_25t_26t_29+2t_14t_25t_
      -----------------------------------------------------------------------
                                                                             
      0t_31-t_3t_26t_31+t_8t_26t_31+t_2t_3-t_1t_4+t_4t_6-t_2t_8              
                                                                             
                                                                             
                                                                             
      t_14t_27t_31+t_7t_14t_29t_31-t_14^2t_29t_31+t_5t_15t_29t_31+t_10t_15t_2
                                                                             
      t_27t_29-t_18t_20t_27t_29+2t_5t_25t_27t_29-t_10t_25t_27t_29+t_7t_18t_28
                                                                             
                                                                             
                                                                             
      7-t_1t_10t_18t_27-t_6t_10t_18t_27-t_7t_11t_18t_27-t_13t_15t_20t_27-t_5t
      _5^2t_25+t_5^2t_6t_25-t_1t_7t_9t_25+t_6t_7t_9t_25-t_5t_8t_9t_25-2t_1t_5
                                                                             
                                                                             
      _14t_27t_31-t_7t_14t_29t_31+t_14^2t_29t_31-t_5t_15t_29t_31-t_10t_15t_29
                                                                             
      14t_31+t_7t_19t_31-t_14t_19t_31+t_5t_20t_31+t_9t_22t_31-2t_5t_26t_31+t_
      _19t_31-2t_6t_18t_19t_31-t_13t_16t_20t_31-t_11t_18t_20t_31+t_18t_19t_20
      _26t_31-t_7t_15t_29t_31-t_14t_15t_29t_31-t_7^2t_31^2+t_5t_15t_31^2-t_7t
      t_17t_29t_31-t_7t_8t_31^2+t_5t_17t_31^2-t_8t_13t_24+t_6t_8t_25-t_8t_12t
      t_31-t_5t_15t_29t_31-t_5t_7t_31^2+t_7t_10t_31^2-t_5t_14t_31^2+t_7t_18t_
      26t_29-2t_6t_18t_27t_29+t_18t_20t_27t_29-2t_5t_25t_27t_29+t_10t_25t_27t
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      9t_31+t_5t_14t_31^2+t_9t_15t_31^2+t_5t_13t_24-t_1t_5t_25-t_5t_6t_25+t_3
                                                                             
      t_29-t_15t_16t_29^2-t_14t_17t_29^2-t_7t_23t_29^2+t_14t_23t_29^2+t_15t_2
                                                                             
                                                                             
                                                                             
      _18t_20t_27+t_10t_18t_20t_27+t_5t_13t_23t_27-t_9t_14t_25t_27-t_13t_14t_
      t_10t_25-t_5t_6t_10t_25+t_3t_9t_10t_25+t_1t_10^2t_25-t_5t_7t_11t_25+t_7
                                                                             
                                                                             
      t_31-t_5t_14t_31^2-t_9t_15t_31^2-t_5t_13t_24+t_1t_5t_25+t_5t_6t_25-t_3t
                                                                             
      10t_26t_31+t_1^2+t_2t_5-t_3t_19-t_1t_20-t_7t_21+t_14t_21+t_19t_22+t_20t
      t_31+t_5t_18t_21t_31-t_10t_18t_21t_31+t_1t_9t_25t_31+t_9t_12t_25t_31+t_
      _13t_24+t_6t_7t_25-t_7t_12t_25-t_11t_15t_25-t_9t_23t_25+t_7t_25t_26+t_5
      _25-t_11t_17t_25-t_9t_24t_25+t_8t_25t_26+t_8t_18t_28+t_16t_17t_29-t_17t
      21-t_5t_13t_24+t_1t_5t_25+t_5t_6t_25-t_3t_9t_25-t_1t_10t_25-t_7t_11t_25
      _29-t_7t_18t_28t_29+t_15t_16t_29^2-t_7t_17t_29^2+t_14t_17t_29^2+t_7t_23
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      t_9t_25+t_1t_10t_25+t_7t_11t_25+t_5t_12t_25-t_11t_14t_25-t_9t_22t_25-t_
                                                                             
      7t_29^2+t_13t_15t_29t_30+t_5t_18t_29t_30-2t_10t_18t_29t_30+t_4t_7t_13t_
                                                                             
                                                                             
                                                                             
      27^2+t_9t_18t_27^2-t_5t_14t_18t_28+t_3t_7t_14t_29+t_7t_8t_14t_29-t_3t_1
      t_10t_11t_25-t_5^2t_12t_25+t_5t_10t_12t_25+t_5t_11t_14t_25-t_10t_11t_14
                                                                             
                                                                             
      _9t_25-t_1t_10t_25-t_7t_11t_25-t_5t_12t_25+t_11t_14t_25+t_9t_22t_25+t_1
                                                                             
      _26-t_26^2-t_19t_27-t_5t_28-t_9t_30                                    
      5t_19t_25t_31-2t_10t_19t_25t_31-t_9t_20t_25t_31+t_18t_19t_26t_31-t_9t_2
      t_25t_27-t_10t_25t_27+t_7t_18t_28-t_8t_15t_29+t_15t_16t_29+t_7t_17t_29-
      _22t_29-t_8t_23t_29-t_7t_24t_29+t_14t_24t_29+t_17t_27t_29+t_5t_25t_30-t
      -t_5t_12t_25+t_11t_14t_25+t_7t_19t_25+t_9t_22t_25+t_10t_25t_26+t_5t_18t
      t_29^2-t_14t_23t_29^2-t_15t_27t_29^2-t_13t_15t_29t_30-t_5t_18t_29t_30+2
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      10t_25t_26-t_5t_18t_28+t_3t_7t_29+t_7t_8t_29-t_3t_14t_29-t_8t_14t_29-t_
                                                                             
      31+t_8^2t_13t_31-t_4t_13t_14t_31-t_2t_13t_15t_31-t_8t_13t_16t_31-2t_6t_
                                                                             
                                                                             
                                                                             
      4^2t_29+t_5t_8t_15t_29-t_1t_14t_15t_29-t_12t_14t_15t_29-t_7t_14t_16t_29
      t_25+t_9t_12t_14t_25+t_9t_11t_15t_25-t_5t_9t_16t_25-t_9^2t_17t_25+t_5t_
                                                                             
                                                                             
      0t_25t_26+t_5t_18t_28-t_3t_7t_29-t_7t_8t_29+t_3t_14t_29+t_8t_14t_29+t_1
                                                                             
                                                                             
      5t_26t_31-t_9t_18t_28t_31-t_1t_7t_29t_31-t_6t_7t_29t_31-t_10t_16t_29t_3
      t_15t_22t_29-2t_7t_23t_29+t_14t_23t_29+2t_15t_27t_29+t_7t_8t_31-t_6t_15
      _10t_25t_30+t_15t_29t_30+t_8^2t_31-t_6t_17t_31-t_8t_22t_31-t_5t_24t_31+
      _28-t_3t_7t_29+t_3t_14t_29+t_8t_14t_29+t_1t_15t_29+t_7t_16t_29-t_14t_16
      t_10t_18t_29t_30+t_8t_13t_16t_31+t_6^2t_18t_31+t_8t_11t_18t_31-t_8t_18t
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      1t_15t_29-t_6t_15t_29-t_7t_16t_29+t_14t_16t_29-t_5t_17t_29+t_15t_20t_29
                                                                             
      13t_17t_31+t_12t_13t_17t_31-t_6^2t_18t_31-2t_5t_13t_24t_31-t_10t_12t_25
                                                                             
                                                                             
                                                                             
      -t_5t_14t_17t_29+t_10t_14t_17t_29+t_15^2t_19t_29+t_7t_15t_20t_29+t_14t_
      14t_19t_25-t_10t_14t_19t_25-t_9t_15t_19t_25+2t_5t_9t_22t_25-t_9t_10t_22
                                                                             
                                                                             
      t_15t_29+t_6t_15t_29+t_7t_16t_29-t_14t_16t_29+t_5t_17t_29-t_15t_20t_29-
                                                                             
                                                                             
      1-t_9t_17t_29t_31+t_15t_19t_29t_31+t_7t_20t_29t_31+t_5t_22t_29t_31+t_9t
      t_31-t_7t_22t_31-t_5t_23t_31+t_15t_26t_31+2t_7t_27t_31+t_3^2+t_4t_7-t_3
      t_17t_26t_31+t_8t_27t_31+t_7t_30t_31+t_3t_4+t_4t_8-t_4t_22-t_2t_23-t_6t
      t_29+t_5t_17t_29-t_5t_23t_29-t_15t_26t_29-t_14t_27t_29-t_7t_13t_30+t_6t
      _19t_31+t_5t_13t_24t_31+t_8t_9t_25t_31+t_10t_12t_25t_31-t_9t_16t_25t_31
      -----------------------------------------------------------------------
                                             
                                             
                                             
                                             
                                             
      +t_14t_27t_29-t_6t_14t_31-t_11t_15t_31+
                                             
      t_31+t_9t_16t_25t_31-t_5t_20t_25t_31+t_
                                             
                                             
                                             
      15t_20t_29+t_5t_15t_22t_29+t_7t_10t_23t
      t_25+t_9^2t_23t_25-t_7t_8t_13t_26+t_3t_
                                             
                                             
      t_14t_27t_29+t_6t_14t_31+t_11t_15t_31-t
                                             
                                             
      _23t_29t_31-2t_5t_27t_29t_31+t_10t_27t_
      t_22-t_1t_23+t_20t_23-t_5t_24+t_10t_24-
      _24+t_12t_24-t_24t_26-t_17t_28+t_23t_28
      _7t_31-t_7t_12t_31+t_6t_14t_31+t_7t_20t
      +t_5t_20t_25t_31-t_10t_20t_25t_31+t_9t_
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      t_15t_19t_31-t_9t_23t_31+t_14t_26t_31-t_10t_27t_31-t_15t_21+t_9t_24-t_1
                                                                             
      10t_20t_25t_31-t_9t_22t_25t_31+2t_6t_18t_26t_31+2t_5t_25t_26t_31-t_18t_
                                                                             
                                                                             
                                                                             
      _29-t_5t_14t_23t_29-t_10t_14t_23t_29+t_9t_15t_23t_29-2t_7t_15t_26t_29+t
      13t_14t_26+t_1t_13t_15t_26+t_6t_13t_15t_26+t_7t_13t_16t_26+t_1t_5t_18t_
                                                                             
                                                                             
      _15t_19t_31+t_9t_23t_31-t_14t_26t_31+t_10t_27t_31+t_15t_21-t_9t_24+t_14
                                                                             
                                                                             
      29t_31-t_1t_5t_31^2+t_1t_10t_31^2-t_5t_12t_31^2+t_10t_12t_31^2-t_9t_16t
      t_23t_26+t_22t_27-t_27^2-t_15t_28-t_7t_30                              
      -t_8t_30+t_22t_30-t_27t_30                                             
      _31-t_7t_26t_31-t_14t_26t_31+t_5t_27t_31+t_1t_3+t_2t_7-t_19t_23-t_9t_24
      22t_25t_31-2t_6t_18t_26t_31-2t_5t_25t_26t_31+t_18t_26^2t_31-t_13t_16t_2
      -----------------------------------------------------------------------
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
      4t_28+t_10t_30                                                       
                                                                           
      26^2t_31+t_13t_16t_27t_31+t_11t_18t_27t_31-t_18t_19t_27t_31+2t_9t_25t
                                                                           
                                                                           
                                                                           
      _14t_15t_26t_29+t_14^2t_27t_29-3t_5t_15t_27t_29-t_5t_13t_15t_30+t_5t_
      26+t_5t_6t_18t_26-t_3t_9t_18t_26-t_1t_10t_18t_26-t_6t_10t_18t_26-t_7t
                                                                           
                                                                           
      t_28-t_10t_30                                                        
                                                                           
                                                                           
      _31^2+t_7t_19t_31^2+2t_5t_20t_31^2-2t_10t_20t_31^2+t_9t_22t_31^2-t_5t
                                                                           
                                                                           
      -t_3t_26-t_1t_27+t_26t_27-t_7t_28+t_14t_28-t_5t_30                   
      7t_31-t_11t_18t_27t_31+t_18t_19t_27t_31-2t_9t_25t_27t_31-t_5t_18t_28t
      -----------------------------------------------------------------------
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
      _27t_31+t_13t_15t_28t_31+t_5t_18t_28t_31+t_7t_8t_29t_31+t_12t_15t_29t
                                                                           
                                                                           
                                                                           
      10t_18t_30-t_3t_7t_10t_31-t_7t_8t_10t_31+t_3t_10t_14t_31+t_5t_6t_15t_
      _11t_18t_26-t_13t_14t_22t_26+t_9t_18t_22t_26+t_5t_13t_23t_26+t_5t_10t
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
      _26t_31^2+t_10t_26t_31^2-t_9t_27t_31^2+t_1t_18t_21+t_6t_18t_21-t_18t_
                                                                           
                                                                           
                                                                           
      _31-2t_7t_8t_29t_31-t_12t_15t_29t_31+t_14t_16t_29t_31-t_5t_17t_29t_31
      -----------------------------------------------------------------------
                                                                          
                                                                          
                                                                          
                                                                          
                                                                          
                                                                          
                                                                          
      _31-t_14t_16t_29t_31+t_5t_17t_29t_31+t_10t_17t_29t_31-t_15t_20t_29t_
                                                                          
                                                                          
                                                                          
      31+t_1t_10t_15t_31-t_5t_12t_15t_31+t_10t_12t_15t_31+t_7t_10t_16t_31+
      _25t_26-t_10^2t_25t_26-2t_9t_14t_25t_26-t_13t_15t_26^2-t_5t_18t_26^2
                                                                          
                                                                          
                                                                          
                                                                          
                                                                          
      20t_21+t_13t_19t_24+t_1t_19t_25+t_12t_19t_25-t_19t_20t_25-t_19t_25t_
                                                                          
                                                                          
                                                                          
      +t_15t_20t_29t_31+t_7t_22t_29t_31-t_14t_22t_29t_31+t_5t_23t_29t_31+t
      -----------------------------------------------------------------------
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
      31-t_7t_22t_29t_31+t_14t_22t_29t_31-t_5t_23t_29t_31-t_14t_27t_29t_31+t
                                                                            
                                                                            
                                                                            
      t_5t_10t_17t_31-t_10^2t_17t_31+t_7t_15t_19t_31+2t_5t_15t_20t_31-2t_10t
      +t_10t_18t_26^2+t_1t_7t_13t_27-t_13t_15t_19t_27-t_5t_18t_19t_27+t_10t_
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
      26-t_18t_19t_28+t_1t_8t_29+t_6t_16t_29-t_17t_19t_29-t_16t_20t_29+t_19t
                                                                            
                                                                            
                                                                            
      _14t_27t_29t_31-t_6t_7t_31^2-t_5t_8t_31^2+t_8t_10t_31^2-t_5t_16t_31^2+
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _13t_14t_30t_31+t_6t_7t_31^2+t_5t_16t_31^2+t_9t_17t_31^2-t_5t_22t_31^2-
                                                                             
                                                                             
                                                                             
      _15t_20t_31+t_9t_15t_22t_31+t_7t_9t_23t_31+t_5t_10t_23t_31-t_9t_14t_23t
      18t_19t_27-t_5t_9t_25t_27+t_9t_10t_25t_27-t_7t_13t_26t_27+t_7^2t_13t_28
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _23t_29-t_8t_26t_29+t_16t_26t_29-t_1t_27t_29-t_6t_27t_29+t_20t_27t_29-t
                                                                             
                                                                             
                                                                             
      t_5t_22t_31^2+t_7t_26t_31^2-t_10t_27t_31^2+t_8t_18t_21-t_6t_13t_24+t_2t
      -----------------------------------------------------------------------
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
      t_7t_26t_31^2+t_10t_27t_31^2+t_6t_13t_24-t_2t_5t_25-t_6^2t_25+t_
                                                                      
                                                                      
                                                                      
      _31-3t_5t_15t_26t_31+t_10t_15t_26t_31-t_10t_14t_27t_31-2t_9t_15t
      -t_7t_13t_14t_28-t_5t_13t_15t_28-t_9t_14t_18t_28-t_1t_7^2t_29+t_
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
      _7t_28t_29-t_1t_13t_30-t_6t_13t_30+t_13t_20t_30+t_5t_29t_30+t_2t
                                                                      
                                                                      
                                                                      
      _5t_25+t_6^2t_25-t_4t_9t_25-t_2t_10t_25-t_8t_11t_25-t_6t_12t_25+
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      4t_9t_25+t_2t_10t_25+t_8t_11t_25+t_6t_12t_25-t_11t_16t_25-t_13t_24t_26-
                                                                             
                                                                             
                                                                             
      _27t_31-t_4t_7t_10-t_8^2t_10+t_3t_7t_12+t_7t_8t_12+t_4t_10t_14-t_3t_12t
      6t_7^2t_29-2t_5t_7t_8t_29+t_1t_7t_14t_29-t_6t_7t_14t_29+2t_5t_8t_14t_29
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _5t_31+t_1t_6t_31+t_6^2t_31-t_4t_9t_31-t_2t_10t_31-t_8t_11t_31-t_1t_12t
                                                                             
                                                                             
                                                                             
      t_11t_16t_25+t_8t_19t_25+t_13t_24t_26+t_12t_25t_26-t_25t_26^2-t_18t_21t
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      t_12t_25t_26+t_25t_26^2+t_18t_21t_27+t_19t_25t_27-t_6t_18t_28+t_5t_25t_
                                                                             
                                                                             
                                                                             
      _14+t_2t_5t_15+t_6^2t_15-t_4t_9t_15-t_8t_11t_15-t_1t_12t_15-t_6t_12t_15
      -t_8t_10t_14t_29+t_7t_12t_14t_29-t_12t_14^2t_29+2t_1t_5t_15t_29+t_5t_6t
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _31-t_6t_12t_31+t_11t_16t_31-t_16t_19t_31+t_1t_20t_31+t_12t_20t_31-t_20
                                                                             
                                                                             
                                                                             
      _27-t_19t_25t_27+t_6t_18t_28-t_5t_25t_28+t_10t_25t_28-t_18t_26t_28-t_4t
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      28-t_10t_25t_28+t_18t_26t_28+t_4t_7t_29+t_8^2t_29-t_4t_14t_29-t_2t_15t_
                                                                             
                                                                             
                                                                             
      +t_8t_10t_16-t_7t_12t_16-t_1t_5t_17-t_5t_6t_17+t_3t_9t_17+t_1t_10t_17+t
      _15t_29-t_3t_9t_15t_29+t_8t_9t_15t_29-t_1t_10t_15t_29+t_5t_7t_16t_29-t_
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      ^2t_31+t_19t_22t_31-t_1t_26t_31-t_6t_26t_31+t_20t_26t_31-t_19t_27t_31-t
                                                                             
                                                                             
                                                                             
      _7t_29+t_4t_14t_29+t_2t_15t_29+2t_8t_16t_29-t_16^2t_29+t_6t_17t_29-t_8t
      -----------------------------------------------------------------------
                                                                
                                                                
                                                                
                                                                
                                                                
                                                                
                                                                
      29-2t_8t_16t_29+t_16^2t_29-2t_6t_17t_29+t_17t_20t_29+t_8t_
                                                                
                                                                
                                                                
      _6t_10t_17+t_7t_11t_17-t_3t_7t_20-t_7t_8t_20+t_3t_14t_20+t
      7t_10t_16t_29+t_10t_14t_16t_29-t_9t_15t_16t_29+t_5^2t_17t_
                                                                
                                                                
                                                                
                                                                
                                                                
      _5t_28t_31+t_10t_28t_31+t_9t_30t_31+t_1t_2+t_2t_6-t_4t_19-
                                                                
                                                                
                                                                
      _22t_29+t_16t_22t_29-t_6t_23t_29-t_17t_26t_29+t_23t_26t_29
      -----------------------------------------------------------------------
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
      22t_29-t_16t_22t_29+t_6t_23t_29-t_5t_24t_29-t_23t_26t_29+t_16t_27t
                                                                        
                                                                        
                                                                        
      _1t_15t_20+t_12t_15t_20+t_7t_16t_20+t_5t_17t_20-t_10t_17t_20-t_15t
      29-t_7t_9t_17t_29-t_5t_10t_17t_29+t_9t_14t_17t_29-t_7t_15t_19t_29+
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
      t_2t_20-t_8t_21+t_16t_21-t_21t_27-t_6t_28+t_20t_28-t_26t_28-t_11t_
                                                                        
                                                                        
                                                                        
      -t_8t_27t_29-t_16t_27t_29+t_27^2t_29-t_15t_28t_29-t_8t_13t_30+t_9t
      -----------------------------------------------------------------------
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
      _29-t_27^2t_29+t_15t_28t_29-t_9t_25t_30-t_13t_27t_30+t_14t_29t_30-
                                                                        
                                                                        
                                                                        
      _20^2+t_15t_19t_22+t_1t_5t_23+t_5t_6t_23-t_3t_9t_23-t_1t_10t_23-t_
      2t_14t_15t_19t_29-t_5t_15t_20t_29+t_7t_10t_22t_29-t_10t_14t_22t_29
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
      30+t_19t_30                                                       
                                                                        
                                                                        
                                                                        
      _25t_30+t_13t_27t_30+t_7t_29t_30-t_14t_29t_30+t_6t_8t_31-t_8t_12t_
      -----------------------------------------------------------------------
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
      t_6t_16t_31-t_11t_17t_31+t_17t_19t_31+t_6t_22t_31-t_
                                                          
                                                          
                                                          
      7t_11t_23-t_5t_12t_23+t_11t_14t_23-t_9t_16t_23-t_14t
      +2t_9t_15t_22t_29+2t_7t_9t_23t_29+t_5t_10t_23t_29-t_
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
      31+t_6t_16t_31+t_8t_20t_31-t_6t_22t_31-t_8t_26t_31-t
      -----------------------------------------------------------------------
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
      9t_24t_31+t_16t_26t_31-t_22t_26t_31-t_12t_27t_31+t_20t_27t_31+t
                                                                     
                                                                     
                                                                     
      _19t_23+t_9t_22t_23+t_15t_20t_26+t_10t_23t_26-t_15t_26^2+t_12t_
      9t_14t_23t_29-2t_7t_14t_26t_29+2t_14^2t_26t_29-t_5t_15t_26t_29+
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
                                                                     
      _16t_26t_31+t_22t_26t_31+t_12t_27t_31-t_20t_27t_31-t_7t_28t_31+
      -----------------------------------------------------------------------
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
      _7t_28t_31-t_10t_30t_31-t_17t_21+t_21t_23+t_11t_24-t_19t_24-t_16t_28+
                                                                           
                                                                           
                                                                           
      14t_27+t_11t_15t_27-t_10t_16t_27-t_9t_17t_27-2t_15t_19t_27-t_14t_20t_
      t_10t_15t_26t_29-2t_5t_14t_27t_29+t_10t_14t_27t_29-2t_9t_15t_27t_29-t
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
      t_5t_30t_31+t_1t_4+t_2t_8-t_21t_23-t_11t_24-t_4t_26-t_2t_27-t_8t_28+t
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      t_22t_28+t_12t_30-t_20t_30                                             
                                                                             
                                                                             
                                                                             
      27+t_9t_23t_27+t_10t_27^2                                              
      _5t_13t_14t_30+t_10t_13t_14t_30-t_9t_13t_15t_30+t_9t_10t_18t_30+t_1t_5t
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _16t_28-t_22t_28+t_27t_28-t_6t_30+t_26t_30                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _7t_31+t_5t_6t_7t_31-2t_3t_7t_9t_31-t_7t_8t_9t_31-t_1t_7t_10t_31-t_7^2t
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _11t_31-t_5t_7t_12t_31+t_5t_6t_14t_31+t_3t_9t_14t_31-t_6t_10t_14t_31+t_
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
      7t_11t_14t_31+t_10t_12t_14t_31+t_1t_9t_15t_31+t_6t_9t_15t_31+t_5t_11t_
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      15t_31-t_5t_10t_16t_31-t_9t_10t_17t_31-t_5t_15t_19t_31-t_10t_15t_19t_31
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      +t_5t_14t_20t_31-t_10t_14t_20t_31+2t_7t_9t_22t_31+t_5t_10t_22t_31+2t_5t
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _9t_23t_31+t_7t_10t_26t_31-3t_5t_14t_26t_31+t_10t_14t_26t_31-2t_9t_15t_
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
      26t_31-t_7t_9t_27t_31-t_9t_14t_27t_31-t_4t_7t_9-t_8^2t_9+t_3t_7t_11+t_
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      7t_8t_11+t_2t_5t_14+t_6^2t_14-t_2t_10t_14-t_3t_11t_14-t_8t_11t_14-t_6t_
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      12t_14+t_2t_9t_15-t_1t_11t_15-t_1t_5t_16-t_5t_6t_16+t_3t_9t_16+t_8t_9t_
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      16+t_1t_10t_16+t_5t_12t_16+t_6t_9t_17-t_5t_11t_17-t_3t_7t_19-t_7t_8t_19
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      +t_3t_14t_19+t_1t_15t_19+t_12t_15t_19+t_7t_16t_19+t_5t_17t_19-t_10t_17t
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      _19-t_15t_19t_20+t_1t_5t_22+t_5t_6t_22-t_3t_9t_22-t_1t_10t_22-t_7t_11t_
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      22-t_5t_12t_22+t_11t_14t_22-t_9t_16t_22+t_9t_22^2+t_10t_19t_23-t_9t_20t
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
                                                                             
      -----------------------------------------------------------------------
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
      _23+t_12t_14t_26+t_11t_15t_26-t_10t_16t_26-t_9t_17t_26-t_15t_19t_26+t_
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
      -----------------------------------------------------------------------
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
      10t_22t_26+2t_9t_23t_26-t_14t_26^2-t_14t_19t_27-t_9t_22t_27+t_9t_27^2 |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |
                                                                            |

                         23                 1
o21 : Matrix (R[t ..t  ])   <-- (R[t ..t  ])
                 1   31             1   31

Ways to use nestedHilbertScheme:

  • nestedHilbertScheme(Matrix,Matrix)

For the programmer

The object nestedHilbertScheme is a method function with options.


The source of this document is in VersalDeformations.m2:1121:0.