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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 Limiting parallel ： ウィキペディア英語版 Limiting parallel In neutral or absolute geometry, and in hyperbolic geometry, there may be many lines parallel to a given line $l$ through a point $P$ not on line $R$; however, in the plane, two parallels may be closer to $l$ than all others (one in each direction of $R$). Thus it is useful to make a new definition concerning parallels in neutral geometry. If there are closest parallels to a given line they are known as the limiting parallel, asymptotic parallel or horoparallel (horo from (ギリシア語:ὅριον ) — border). For rays, the relation of limiting parallel is an equivalence relation, which includes the equivalence relation of being coterminal. Limiting parallels may form two, or three sides of a limit triangle. ==Definition== A rays $Aa$ is a limiting parallel to a ray $Bb$ if they are coterminal or if they lie on distinct lines not equal to the line $AB$, they do not meet, and every ray in the interior of the angle $BAa$ meets the ray $Bb$. 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「Limiting parallel」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.