Russell's paradox concerns itself with the set [tex]S=\{x|x\notin x\}\;\;\;S\in S ?[/tex] but it is supposedly solved in ZFC theory.(adsbygoogle = window.adsbygoogle || []).push({});

Now, what about the set [tex]U=\{y|y\in y\}\;\;\;U\in U ?[/tex]

Is U an element of itself?

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# The set of all sets which are elements of themselves

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