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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 Birkhoff factorization ： ウィキペディア英語版 Birkhoff factorization In mathematics, Birkhoff factorization or Birkhoff decomposition, introduced by , is the factorization of an invertible matrix ''M'' with coefficients that are Laurent polynomials in ''z'' into a product ''M'' = ''M''+''M''0''M''−, where ''M''+ has entries that are polynomials in ''z'', ''M''0 is diagonal, and ''M''− has entries that are polynomials in ''z''−1. There are several variations where the general linear group is replaced by some other reductive algebraic group, due to . Birkhoff factorization implies the Birkhoff–Grothendieck theorem of that vector bundles over the projective line are sums of line bundles. Birkhoff factorization follows from the Bruhat decomposition for affine Kac-Moody groups (or loop groups), and conversely the Bruhat decomposition for the affine general linear group follows from Birkhoff factorization together with the Bruhat decomposition for the ordinary general linear group. ==References== * * * * 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「Birkhoff factorization」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.