cohomology

cohomology -- a method name available for computing expressions of the forms HH^i(X) and HH^i(M,N).

If it is intended that i be of class ZZ, M be of class A, and N be of class B, then the method can be installed with 

        cohomology(ZZ, A, B) := (i,M,N) -> ...

See also homology and ScriptedFunctor.

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