Jisho

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近傍 (位相空間論)
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Wikipedia definition
1. Neighbourhood (mathematics)​In topology and related areas of mathematics, a neighbourhood (or neighborhood) is one of the basic concepts in a topological space. Intuitively speaking, a neighbourhood of a point is a set containing the point where you can move that point some amount without leaving the set. This concept is closely related to the concepts of open set and interior.
Read “Neighbourhood (mathematics)” on English Wikipedia
Read “近傍 (位相空間論)” on Japanese Wikipedia
Read “Neighbourhood (mathematics)” on DBpedia

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