This started a bit of a competition, some other versions of the same proofs in Agda and Lean are linked from here: https://mastodon.online/@nomeata/110004145921

This started a bit of a competition, some other versions of the same proofs in Agda and Lean are linked from here: https://mastodon.online/@nomeata/110004145921681756 https://mastodon.online/@nomeata/110004145921681756