∀ {C : Type u_4} [inst : CategoryTheory.Category.{u_3, u_4} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  {D : Type u_2} [inst_2 : CategoryTheory.Category.{u_1, u_2} D] (e : C ≌ D) (X Y : C),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.Functor.OplaxMonoidal.δ (CategoryTheory.Monoidal.equivalenceTransported e).symm.inverse X Y)
      (CategoryTheory.Functor.LaxMonoidal.μ (CategoryTheory.Monoidal.equivalenceTransported e).symm.inverse X Y) =
    CategoryTheory.CategoryStruct.id
      ((CategoryTheory.Monoidal.equivalenceTransported e).symm.inverse.obj
        (CategoryTheory.MonoidalCategoryStruct.tensorObj X Y))