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foldComplex -- converts a chain complex into a differential module

Synopsis

Description

Given a chain complex C and integer d it creates the corresponding (flag) differential module of degree d.

i1 : R = QQ[x,y];
i2 : C = complex res ideal(x,y)

      1      2      1
o2 = R  <-- R  <-- R
                    
     0      1      2

o2 : Complex
i3 : D = foldComplex(C,0);
i4 : D.dd_1

o4 = {0} | 0 x y 0  |
     {1} | 0 0 0 -y |
     {1} | 0 0 0 x  |
     {2} | 0 0 0 0  |

             4      4
o4 : Matrix R  <-- R

See also

Ways to use foldComplex :

For the programmer

The object foldComplex is a method function.