Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-03-19 20:21 9abfa6f0

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refactor(linear_algebra/matrix/hermitian): golf and generalize (#18565) A handful of these results can be proven trivially using results about is_self_adjoint. This also generalizes the typeclass arguments throughout the file, though largely in a mathematically meaningless way.

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