Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2019-09-20 11:08 708a28cc

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chore(algebra/group/units): use def to_units instead of has_lift (#1431)

  • chore(algebra/group/units): use def to_units instead of has_lift
  • Move, upgrade to mul_equiv, add documentation

Estimated changes