descents w
A permutation $p=(p_1 \, \dots \, p_n)$ has a descent at $i$ (for $i < n$) if $p(i) > p(i+1)$.
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The object descents is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Permutations/Documentation/mainDocs.m2:187:0.