Synopsis:
HH^i C -- homology at the i-th spot of the chain complex C.
By definition, this is the same as HH_(-i) C.
Code:
-- ../../../Macaulay2-0.9.2/Macaulay2/m2/chaincomplexes.m2:450 cohomology(ZZ,ChainComplex) := Module => opts -> (i,C) -> homology(-i, C)