Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-03-10 11:57 ccd35db8

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feat(linear_algebra/matrix): to_matrix and to_lin as alg_equiv (#6496) The existing linear_map.to_matrix and matrix.to_lin can be upgraded to an alg_equiv if working on linear endomorphisms or square matrices. The API is copied over in rote fashion.

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