漸屈線曲線微分幾何中的概念,它是曲線上密切圓圓心的軌跡。等價的描述是一條曲線的漸屈線即是其法線包絡

漸屈線與漸伸線是一對相對的概念,若曲線A是曲線B的漸屈線,曲線B即為曲線A的漸伸線。每條曲線的漸屈線唯一確定,但卻可以有無窮多條漸伸線。

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