lastDescent w
Given a non-identity permutation in 1-line notation, finds the location of its last descent, i.e., the greatest $i$ so that $w_{i+1}<w_i$.
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The object lastDescent is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/MatrixSchubert/permutationMethodsDOC.m2:63:0.