Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-09 14:16 75f5289e

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feat(data/list/perm): binding all the sublists of a given length gives all the sublists (#15834) This is essentially the defining relation between sublists' and sublists_len. This also adds a few other trivial lemmas about sublists_len.

Estimated changes