Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-04-19 20:26 094b1f51

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chore(*/matrix): order m and n alphabetically (#13510) In a few places this also reorders (n) [fintype n] (m) [fintype m] to (m n) [fintype m] [fintype n] which seems to be where we prefer to put typeclasses.

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