vexillary permutation
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English
Etymology
So called because they are related to flags of modules.
Noun
vexillary permutation (plural vexillary permutations)
- (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).