descentSet w
Given a permutation in 1-line notation, lists the location of its descents, i.e., the least $i$ so that $w_{i+1}<w_i$.
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The object descentSet is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/MatrixSchubert/permutationMethodsDOC.m2:102:0.