I understand how the argument goes- let X be the set of all sets which don't contain themselves.(adsbygoogle = window.adsbygoogle || []).push({});

If X contains itself, then X is not in X

If X doesnt contain itself, then X is X

the part i dont understand is, What on earth does it mean for a set to contain itself?

garbage in, garbage out?

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# Russell's paradox

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