isVexillary w
Given a permutation in 1-line notation, checks if the permutation is vexillary, i.e. $2143$-avoiding. A permutation $w$ is $2143$-avoiding if there do not exist indices $i < j < k < l$ such that $w_j < w_i < w_l < w_k$.
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The object isVexillary is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/MatrixSchubert/permutationMethodsDOC.m2:291:0.