HH_i C

     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(| -y |,| xy  |)
                      | x  | | -x2 |
     
                                      2
          R - module, subquotient of R
     

     i4 = prune M
     
     o4 = cokernel | x |
     
                                   1
          R - module, quotient of R
     

See also HH, ChainComplex, and ScriptedFunctor.

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