Commit 2021-10-05 16:47 800f2dcf

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feat: list permutations and pairwise (#56) The only thing that isn't just an addition from mathlib is changing the binder on subset to a weak implicit.

Estimated changes

added theorem List.Perm.Equivalence
added theorem List.Perm.subset
added theorem List.Perm.swap'
added inductive List.Perm
added theorem List.Perm_comm
added theorem List.perm_middle