this, the Quine atom 𝑥 = {𝑥} from non-well-founded set theory, is retroactively me https://en.wikipedia.org/wiki/Quine_atom
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…thus causing the paradox that "Quine atom" both does and does not include a "y", which is why they're not in standard set theory. (…or should that be "Quiney atom"?)
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