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Cool Twitter thread about \(G\)-sets

Proof of the second-incompleteness theorem via the proof speed-up phenomenon by Joel David Hamkins (on Twitter)

A good Twitter thread about the absolute Galois group of ℂ(T) by David Madore, who also has these excellent blog posts:

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Great videos: Abel’s theorem, Regular Polyhedra, Counting Points on the E₈ lattice, Gareth Jones explains Dessins d’enfants

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