Phrase guide
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noun
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).
Definition source: English Wiktionary via Wiktextract
Topics: mathematics, sciences
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Synonyms: none provided
Antonyms: none provided
History
So called because they are related to flags of modules.
