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sona@stau.space (Sona Tau Estrada Rivera) — Tue, 21 Jul 2026 14:11:58 -0400

First, I’d like to start with a quick sentence a friend said a really long time ago while we were taking Calculus I:

A set is just its cardinality.

At first, my reaction was to dismiss that as nonsense. I mean, look at these sets: $\{1\}$, $\{2\}$. They look very different to me, but their cardinality is the same. You mean to tell me that I can uniquely identify sets by their cardinality? I’ll cut the sarcasm now; yes you can do that identification and it’s actually not that crazy.

Philosophy on stau.space

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