∀ {M : Type u_1} [inst : CommMonoid M] {S : Submonoid M} {N : Type u_2} [inst_1 : CommMonoid N]
  (f : S.LocalizationMap N) {a₁ b₁ : M} {a₂ b₂ : ↥S}, f.mk' a₁ a₂ = f.mk' b₁ b₂ ↔ (Localization.r S) (a₁, a₂) (b₁, b₂)