Defines the sum of NCRingMaps. Though a linear combination of ring maps is not a ring map in general, this routine is useful in constructing ring maps programmatically. The sum is defined only on generators of the common source of f and g, while for higher degree monomials m, one no longer has f(m) + g(m) = h(m) (so it is only the sum on words of length 1).
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/NCAlgebra/NCAlgebraDoc.m2:4335:0.