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Alexander 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 which agree on the boundary sphere 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
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