∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.CartesianMonoidalCategory C]
  {G H X : C} [inst_2 : CategoryTheory.GrpObj G] [inst_3 : CategoryTheory.GrpObj H] (f : X ⟶ G) (g : G ⟶ H)
  [CategoryTheory.IsMonHom g], CategoryTheory.CategoryStruct.comp f⁻¹ g = (CategoryTheory.CategoryStruct.comp f g)⁻¹