Can you ever have two sets $a$ and $b$ with $a \in b \in a$? It doesn’t appear to contradict Russell’s paradox. Does it go against any ZF axioms? Feels like it might contradict regularity but I can’t seem to prove it.
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2https://math.stackexchange.com/questions/676121/are-there-sets-a-and-b-such-that-a-in-b-and-b-in-a – Scene Apr 24 '23 at 01:46
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These questions solved it thanks guys – Darby Bond Apr 24 '23 at 01:49