Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2019-08-06 15:58 57c1d6d7

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chore(data/matrix): protect some lemmas (#1304)

Estimated changes

Modified src/data/matrix.lean

deleted theorem matrix.add_mul

deleted theorem matrix.mul_add

deleted theorem matrix.mul_zero

deleted theorem matrix.zero_mul