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# cohomology -- general cohomology functor

## Description

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) := opts -> (i,M,N) -> ...

## See also

- homology -- general homology functor
- HH -- general homology and cohomology functor
- ScriptedFunctor -- the class of all scripted functors

### Menu

- HH^ZZ Module -- local cohomology of a module

## Ways to use cohomology:

- HH^ZZ Module -- local cohomology of a module

## For the programmer

The object cohomology is a method function with options.

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/Macaulay2Doc/functions/cohomology-doc.m2:25:0.