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source(RingMap) -- find the source ring for a map of rings

Synopsis

Description

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

Ways to use this method: