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等長写像

File:Academ_Reflections_with_parallel_axis_on_wallpaper.svg · Wikimedia Commons · See Wikimedia Commons

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等長写像

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Also known as congruence, congruent transformation

thumb|upright=1.4|A Function composition|composition of two opposite isometries is a direct isometry. A reflection in a line is an opposite isometry, like (reflection w.r.t the center diagonal line) or (reflection w.r.t the right diagonal line) on the image. Translation is a direct isometry: a rigid motion.

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geometric motion
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Article · 日本語

数学、とくに幾何学において等長写像(とうちょうしゃぞう)または等距離写像(とうきょりしゃぞう)とは、"長さ" を変えない(距離を保つ、distance preserving)写像のことである。全単射であるものに限って等長写像 (isometry) という場合もある。

Abstract from DBpedia / Wikipedia · CC BY-SA

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