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ring(Complex) -- access the ring of a complex or a complex map

Description

Every complex or complex map has a base ring. This function access that information.

i1 : S = ZZ/101[a,b,c,d];
 
i2 : C = freeResolution coker vars S

      1      4      6      4      1
o2 = S  <-- S  <-- S  <-- S  <-- S
                                  
     0      1      2      3      4

o2 : Complex
 
i3 : ring C

o3 = S

o3 : PolynomialRing
 
i4 : assert(ring C === S)
 
i5 : ring id_C

o5 = S

o5 : PolynomialRing
 
i6 : assert(ring id_C === S)

See also

Ways to use this method:

  • ring(Complex) -- access the ring of a complex or a complex map
  • ring(ComplexMap)

The source of this document is in Complexes/ChainComplexDoc.m2:274:0.