isWellDefined w
isWellDefined(w)
isWellDefined p determines if p is a valid permutation. Permutations must be constructed from lists consisting of only the integers $1 \textemdash n$. If a list contains any other elements or does not consist of the entire range, then an error is thrown.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Permutations/Documentation/mainDocs.m2:471:0.