∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {D : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} D]
  {e : C ≌ D},
  CategoryTheory.Equivalence.mkHom (CategoryTheory.CategoryStruct.id e.inverse) =
    CategoryTheory.CategoryStruct.id e.symm