Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-08-02 10:07 4a9cbdb1

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feat(data/matrix/basic): provide equiv versions of matrix.map, linear_map.map_matrix, and ring_hom.map_matrix. (#8468) This moves all of these definitions to be adjacent, adds the standard family of functorial simp lemmas, and relaxes some typeclass requirements. This also renames matrix.one_map to matrix.map_one to match matrix.map_zero.

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