Hom(M, f)Hom(f, N)$\mathrm{Hom}$ is a functor which is contravariant in the first argument and covariant in the second argument. This method implements the functoriality on morphisms.
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The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/CpMackeyFunctors/Documentation/HomGroupDoc.m2:60:0.