g = map(M,N,p,f)
g = map(M,,p,f)
g = map(M,p)
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If the module N is replaced by null, which is entered automatically between consecutive commas, then a free module will be used for N, whose degrees are obtained by lifting the degrees of the cover of the source of g, minus the degree of g, along the degree map of p
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If N and f are both omitted, along with their commas, then for f the matrix of generators of M is used.
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The degree of the homomorphism enters into the determination of its homogeneity.
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The source of this document is in Macaulay2Doc/doc14.m2:72:0.