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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 Fermat cubic ： ウィキペディア英語版 Fermat cubic In geometry, the Fermat cubic, named after Pierre de Fermat, is a surface defined by :$x^3\; +\; y^3\; +\; z^3\; =\; 1.\; \backslash$ Methods of algebraic geometry provide the following parametrization of Fermat's cubic: :$x(s,t)\; =$ :$y(s,t)\; =$ :$z(s,t)\; =\; .$ In projective space the Fermat cubic is given by :$w^3+x^3+y^3+z^3=0.$ The 27 lines lying on the Fermat cubic are easy to describe explicitly: they are the 9 lines of the form (''w'' : ''aw'' : ''y'' : ''by'') where ''a'' and ''b'' are fixed numbers with cube −1, and their 18 conjugates under permutations of coordinates. ::::''Real points of Fermat cubic surface.'' ==References== * *(【引用サイトリンク】title=Complete cubic parametrization of the Fermat cubic surface ) 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「Fermat cubic」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.