Given a Schur ring S, the function numgens outputs the number of generators of S. This is equal to the relative dimension of S over its base ring, and also to the maximal number of parts of a partition allowed as an index for the elements of S.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/SchurRings.m2:1859:0.