Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-05-21 20:35 fd45e288

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fix(*): do not nolint simp_nf (#2734) The nolint simp_nf for subgroup.coe_coe was hiding an actual nontermination issue. Please just ping me if you're unsure about the simp_nf linter.

Estimated changes

deleted theorem div_zero
deleted theorem inv_zero
deleted theorem div_zero'
added theorem div_zero
deleted theorem inv_zero'
added theorem inv_zero