vexillary permutation

English

Etymology

So called because they are related to flags of modules.

Noun

vexillary permutation (plural vexillary permutations)

  1. (mathematics) A permutation μ of the positive integers containing no subpermutation isomorphic to the permutation (2143); in other words, there do not exist four numbers i < j < k < l with μ(j) < μ(i) < μ(l) < μ(k).
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