∀ {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] [inst_3 : CategoryTheory.MonoidalCategory D]
  {F : CategoryTheory.Functor C D} (h : F.CoreMonoidal) (X Y : C),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Functor.OplaxMonoidal.δ F X Y)
      (CategoryTheory.Functor.LaxMonoidal.μ F X Y) =
    CategoryTheory.CategoryStruct.id (F.obj (CategoryTheory.MonoidalCategoryStruct.tensorObj X Y))