開かつ閉集合
1. Clopen setIn topology, a clopen set (a portmanteau of closed-open set) in a topological space is a set which is both open and closed. That this is possible for a set is not as counter-intuitive as it might seem if the terms open and closed were taken by their colloquial meaning as antonyms; mathematically, they are not antonyms.
Read “Clopen set” on English Wikipedia
Read “開かつ閉集合” on Japanese Wikipedia
Read “Clopen set” on DBpedia
Read “Clopen set” on English Wikipedia
Read “開かつ閉集合” on Japanese Wikipedia
Read “Clopen set” on DBpedia
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