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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 Alexander's trick ： ウィキペディア英語版 Alexander's trick Alexander's trick, also known as the Alexander trick, is a basic result in geometric topology, named after J. W. Alexander. ==Statement== Two homeomorphisms of the ''n''-dimensional ball $D^n$ which agree on the boundary sphere $S^$ are isotopic. More generally, two homeomorphisms of ''D''''n'' that are isotopic on the boundary are isotopic. 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「Alexander's trick」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.