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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 Genus-2 surface ： ウィキペディア英語版 Genus-2 surface In mathematics, a genus-2 surface (also known as a double torus or two-holed torus) is a surface formed by the connected sum of two tori. That is to say, from each of two tori the interior of a disk is removed, and the boundaries of the two disks are identified (glued together), forming a double torus. This is the simplest case of the connected sum of ''n'' tori. A connected sum of tori is an example of a two-dimensional manifold. According to the classification theorem for 2-manifolds, every compact connected 2-manifold is either a sphere, a connected sum of tori, or a connected sum of real projective planes. Double torus knots are studied in knot theory. ==Example== The Bolza surface is the most symmetric Riemann surface of genus 2. 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「Genus-2 surface」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.