Corner point

Japanese: 角点 - かくてん
Corner point

…At each point on the oval line C , tangents can be drawn from both the left and right sides. The points where these do not coincide are called corner points. There are at most countable number of such points. …

*Some of the terminology explanations that mention "corner points" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…卵形線C上の各点には左側および右側からの接線がひける。これらが一致しない点を角点という。これはたかだか可算個しかない。…

※「角点」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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