Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-11-12 00:24 49cf28fe

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feat(data/matrix): little lemmas on map (#4874) I had a couple of expressions involving mapping matrices, that the simplifier didn't simp away. It turns out the missing lemmas already existed, just not with the correct form / hypotheses. So here they are.

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