bn:17381899n
Noun Concept
JA
射影的補完実数直線  射影的補完数直線  射影補完実数直線  射影補完数直線
EN
In real analysis, the projectively extended real line, is the extension of the set of the real numbers, R {\displaystyle \mathbb {R} }, by a point denoted ∞. Wikipedia
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