∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {M : Type u_1} [inst_1 : CategoryTheory.Category.{v_1, u_1} M]
  [inst_2 : CategoryTheory.MonoidalCategory M] (F : CategoryTheory.Functor M (CategoryTheory.Functor C C)) {m n : M}
  {X Y : C} (f : X ⟶ Y) [inst_3 : F.LaxMonoidal] {Z : C}
  (h : (F.obj (CategoryTheory.MonoidalCategoryStruct.tensorObj m n)).obj Y ⟶ Z),
  CategoryTheory.CategoryStruct.comp ((F.obj n).map ((F.obj m).map f))
      (CategoryTheory.CategoryStruct.comp ((CategoryTheory.Functor.LaxMonoidal.μ F m n).app Y) h) =
    CategoryTheory.CategoryStruct.comp ((CategoryTheory.Functor.LaxMonoidal.μ F m n).app X)
      (CategoryTheory.CategoryStruct.comp ((F.obj (CategoryTheory.MonoidalCategoryStruct.tensorObj m n)).map f) h)