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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 Pinched torus ： ウィキペディア英語版 Pinched torus In mathematics, and especially topology and differential geometry, a pinched torus (or croissant surface) is a kind of two-dimensional surface. It gets its name from its resemblance to a torus that has been pinched at a single point. A pinched torus is an example of an orientable, compact 2-dimensional pseudomanifold. == Parametrisation == A pinched torus is easily parametrisable. Let us write . An example of such a parametrisation − which was used to plot the picture − is given by where: :$f(x,y)\; =\; \backslash left(\; g(x,y)\backslash cos\; x\; ,\; g(x,y)\backslash sin\; x\; ,\; \backslash sin\backslash !\backslash left(\backslash frac\backslash right)\backslash sin\; y\; \backslash right)$ 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「Pinched torus」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.