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Supertransitive class : ウィキペディア英語版
Supertransitive class
In set theory, a supertransitive class is a transitive class 〔Any element of a transitive set must also be its subset. See Definition 7.1 of 〕 which includes as a subset the power set of each of its elements.
Formally, let ''A'' be a transitive class. Then ''A'' is supertransitive if and only if
:(\forall x)(x\in A \to \mathcal(x) \subseteq A).〔See Definition 9.8 of 〕
Here ''P''(''x'') denotes the power set of ''x''.〔''P''(''x'') must be a set by axiom of power set, since each element ''x'' of a class ''A'' must be a set (Theorem 4.6 in Takeuti's text above).〕
==See also==

* Transitive set
* Rank (set theory)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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