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Jul 19, 2019 at 13:46 vote accept Andrea Ferretti
Jul 18, 2019 at 20:43 history became hot network question
Jul 18, 2019 at 19:57 comment added Noah Snyder Alternatively, if you don't care about working constructively, you can see Lagrange's theorem fully proved in code in a type theory with LEM in the Lean Mathlib where I think it's the lemma "card_subgroup_dvd_card".
Jul 18, 2019 at 19:03 answer added Mike Shulman timeline score: 13
Jul 18, 2019 at 18:57 comment added Noah Snyder As discussed below this isn't really about group theory, it's about finite sets. There's a paper on finite sets in HoTT that you might like. cs.ru.nl/~nweide/FiniteSetsInHoTT.pdf
Jul 18, 2019 at 16:29 answer added Neil Strickland timeline score: 4
Jul 18, 2019 at 15:40 answer added Valery Isaev timeline score: 6
Jul 18, 2019 at 15:00 answer added Noah Snyder timeline score: 6
Jul 18, 2019 at 12:34 history asked Andrea Ferretti CC BY-SA 4.0