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Macaulay2Doc :: HH_ZZ ChainComplex

HH_ZZ ChainComplex -- homology of a chain complex

Synopsis

Description

i1 : R = ZZ/101[x,y]

o1 = R

o1 : PolynomialRing
i2 : C = chainComplex(matrix{{x,y}},matrix{{x*y},{-x^2}})

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

o2 : ChainComplex
i3 : M = HH_1 C

o3 = subquotient ({1} | -y |, {1} | xy  |)
                  {1} | x  |  {1} | -x2 |

                               2
o3 : R-module, subquotient of R
i4 : prune M

o4 = cokernel {2} | x |

                            1
o4 : R-module, quotient of R