rank D
Use this function to recover the rank of the torus factor of a diagonal action.
The following example defines an action of a two-dimensional torus on a polynomial ring in four variables.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/InvariantRing/AbelianGroupsDoc.m2:352:0.