"I could prove Yoneda's lemma for you, but there's only one first time to see the proof in one's life, and I think each of you deserves the chance of finding it on your own, without spoilers." From today's lecture.
Replying to @BarbaraFantechi
Really, most of the magic is already there in the proof of Cayley's theorem. (I guess maybe there's a small residual thrill in the realization of how close the resemblance is between Cayley and Yoneda.)
9:58 AM - 14 Oct 2019
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