source f
i1 : S = ZZ/10007[x, y, z];
i2 : R = ZZ/10007[t];
i3 : f = map(R,S,{t^3,t^4,t^5}) 3 4 5 o3 = map (R, S, {t , t , t }) o3 : RingMap R <-- S
i4 : source f o4 = S o4 : PolynomialRing
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Macaulay2Doc/functions/source-doc.m2:28:0.