isVexillary w
A permutation $p$ is vexillary if it is $2143$-avoiding.
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This method was ported over from the MatrixSchubert (missing documentation) package.
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/Permutations/Documentation/patternAvoidanceDocs.m2:179:0.