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You know a mathematical object by the company it keeps. The yoneda lemma essentially means an object is what it does: See here for better explanation:https://www.math3ma.com/blog/the-yoneda-perspective …
That and the followup post (with more details) look very interesting!
I also recommend Tai Danae's booklet on Applied category theory, a bit longer than a 2 minute explanation, but it gives an intro into category theory modeling things that can be stuck together like language, electric circuits, and chemical reactions.https://www.math3ma.com/blog/notes-on-act …
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