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my kid asked me if it was opposite day today.

broke my head.

good time to teach him/her about Russell's Paradox and Zermelo-Frankel set theory.

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Zermelo-Frankel set theory

I didn't know about this previously. Just went down a pleasant rabbit hole. Thanks!

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0 sats \ 2 replies \ @ek 9 Dec

So your head didn't break?

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it was opposite day.

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0 sats \ 0 replies \ @ek 9 Dec

Yes

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