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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Vexillary permutation ： ウィキペディア英語版 Vexillary permutation In mathematics, a vexillary permutation is 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''). They were introduced by . The word "vexillary" means flag-like, and comes from the fact that vexillary permutations are related to flags of modules. showed that vexillary involutions are enumerated by Motzkin numbers. ==See also== *Riffle shuffle permutation, a subclass of the vexillary permutations 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vexillary permutation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.