Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-05 07:41 4f7603c7

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chore(data/matrix/basic): add more lemmas about conj_transpose and smul (#13938) Unfortunately the star_module typeclass is of no help here; see this Zulip thread for some discussion. In the meantime, this adds the lemmas for the most frequent special cases.

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