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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 Eisenstein triple ： ウィキペディア英語版 Eisenstein triple Similar to a Pythagorean triple, an Eisenstein triple is a set of integers which are the lengths of the sides of a triangle where one of the angles is 60 degrees. ==Triangles with an angle of 60°== Triangles with an angle of 60° are a special case of the Law of Cosines:〔Gilder, J., Integer-sided triangles with an angle of 60°," Mathematical Gazette 66, December 1982, 261 266〕〔Burn, Bob, "Triangles with a 60° angle and sides of integer length," Mathematical Gazette 87, March 2003, 148–153.〕〔Read, Emrys, "On integer-sided triangles containing angles of 120° or 60°", ''Mathematical Gazette'', 90, July 2006, 299–305.〕 :$c^2\; =\; a^2\; -\; ab\; +\; b^2.$ When the lengths of the sides are integers, the values form a set known as an Eisenstein triple.〔http://www2.edc.org/cme/showcase/slides.delaware.2006.pdf〕 Examples of Eisenstein triples include:〔http://www.had2know.com/academics/integer-triangles-60-degree-angle.html〕 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「Eisenstein triple」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.