Given a ring map $\phi : R \to S$, this finds the conductor, the annihilator of $S/R$ as an $R$ module.
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The object conductorOfRingMap is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Seminormalization.m2:821:0.