Jisho

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むげんえんてん 無限遠点
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Noun
1. point at infinity​Mathematics
Wikipedia definition
2. Point at infinity​The point at infinity, also called ideal point, of the real number line is a point which, when added to the number line yields a closed curve called the real projective line, . The real projective line is not equivalent to the extended real number line, which has two different points at infinity. The point at infinity can also be added to the complex plane,, thereby turning it into a closed surface (i.e.
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