翻訳と辞書 Words near each other ・ Orientalizing period ・ Orientamenti ・ Orientate ・ Orientation ・ Orientation (computer vision) ・ Orientation (EP) ・ Orientation (geometry) ・ Orientation (graph theory) ・ Orientation (Heroes) ・ Orientation (Lost) ・ Orientation (mental) ・ Orientation (sign language) ・ Orientation (vector space) ・ Orientation and Mobility ・ Orientation camps in Hong Kong ・ Orientation character ・ Orientation column ・ Orientation entanglement ・ Orientation of a vector bundle ・ Orientation of churches ・ Orientation sensing ・ Orientation tensor ・ Orientational glass ・ Orientations ・ Orientations of Proteins in Membranes database ・ Orientative case ・ OrientDB ・ Oriente ・ Oriente (comarca) ・ Oriente (Ecuador) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Orientation character ： ウィキペディア英語版 Orientation character In algebraic topology, a branch of mathematics, an ''orientation character'' on a group $\backslash pi$ is a group homomorphism :$\backslash omega\backslash colon\; \backslash pi\; \backslash to\; \backslash left\backslash$. This notion is of particular significance in surgery theory. ==Motivation== Given a manifold ''M'', one takes $\backslash pi=\backslash pi\_1\; M$ (the fundamental group), and then $\backslash omega$ sends an element of $\backslash pi$ to $-1$ if and only if the class it represents is orientation-reversing. This map $\backslash omega$ is trivial if and only if ''M'' is orientable. The orientation character is an algebraic structure on the fundamental group of a manifold, which captures which loops are orientation reversing and which are orientation preserving. 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「Orientation character」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.