f ++ g
This will create a sheaf map h which is the direct sum of f and g.
i1 : R = QQ[x,y,z] o1 = R o1 : PolynomialRing
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Varieties/doc-maps.m2:231:0.