Jisho

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位相特徴付
Wikipedia definition
1. Characterizations of the category of topological spacesIn mathematics, a topological space is usually defined in terms of open sets. However, there are many equivalent characterizations of the category of topological spaces. Each of these definitions provides a new way of thinking about topological concepts, and many of these have led to further lines of inquiry and generalisation.
Read “Characterizations of the category of topological spaces” on English Wikipedia
Read “位相の特徴付け” on Japanese Wikipedia
Read “Characterizations of the category of topological spaces” on DBpedia

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