That makes sense I guess.
this post was submitted on 19 Feb 2025
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Hmmm. There's room for a slash from the top left to bottom right to disambiguate this, but it'll likely end up with more slashed Os and 0s.
⦰ is a reversed empty set.
Also great: 𝟶
Ah yes, the full set
he'll always try to stop me, that Nicolas Bourbaki.