クラス (集合論)
1. Class (set theory)In set theory and its applications throughout mathematics, a class is a collection of sets (or sometimes other mathematical objects) which can be unambiguously defined by a property that all its members share. The precise definition of "class" depends on foundational context. In work on ZF set theory, the notion of class is informal, whereas other set theories, such as NBG set theory, axiomatize the notion of "class", e.g. , as entities that are not members of another entity.
Read “Class (set theory)” on English Wikipedia
Read “クラス (集合論)” on Japanese Wikipedia
Read “Class (set theory)” on DBpedia
Read “Class (set theory)” on English Wikipedia
Read “クラス (集合論)” on Japanese Wikipedia
Read “Class (set theory)” on DBpedia
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