compose(M, N, P)
In the following example we check that the map does implement the composition map $$ \mathrm{Hom}(M,N) \otimes \mathrm{Hom}(N,P) \to \mathrm{Hom}(M,P). $$
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The modules should be defined over the same ring.
The object compose is a method function with options.
The source of this document is in Macaulay2Doc/functions/Hom-doc.m2:431:0.