Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-08-09 13:47 8196d4a2

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chore(algebra/group/units): Make coercion the simp-normal form of units (#8568) It's already used as the output for @[simps]; this makes ↑u the simp-normal form of u.val and ↑(u⁻¹) the simp-normal form of u.inv.

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