∀ {α : Type u_1} [inst : Group α] (s : Subgroup α),
  QuotientGroup.quotientRightRelEquivQuotientLeftRel s =
    { toFun := Quotient.map' (fun g => g⁻¹) ⋯, invFun := Quotient.map' (fun g => g⁻¹) ⋯, left_inv := ⋯, right_inv := ⋯ }