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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 Bitangent ： ウィキペディア英語版 Bitangent In mathematics, a bitangent to a curve ''C'' is a line ''L'' that touches ''C'' in two distinct points ''P'' and ''Q'' and that has the same direction as ''C'' at these points. That is, ''L'' is a tangent line at ''P'' and at ''Q''. ==Bitangents of algebraic curves== In general, an algebraic curve will have infinitely many secant lines, but only finitely many bitangents. Bézout's theorem implies that a plane curve with a bitangent must have degree at least 4. The case of the 28 bitangents of a quartic was a celebrated piece of geometry of the nineteenth century, a relationship being shown to the 27 lines on the 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「Bitangent」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.