AddCon.liftOn

{M : Type u_1} →
  [inst : Add M] → {β : Sort u_4} → {c : AddCon M} → c.Quotient → (f : M → β) → (∀ (a b : M), c a b → f a = f b) → β

The function on the quotient by a congruence relation c induced by a function that is constant on c's equivalence classes.

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