∀ {D : Type u_1} {D' : Type u_2} {inst : CategoryTheory.Category.{v_1, u_1} D}
  {inst_1 : CategoryTheory.Category.{v_2, u_2} D'} (F : CategoryTheory.Functor D D') {C : Type u_3}
  {inst_2 : CategoryTheory.Category.{v_3, u_3} C} {inst_3 : CategoryTheory.MonoidalCategory C}
  {inst_4 : CategoryTheory.MonoidalCategory.MonoidalLeftAction C D}
  {inst_5 : CategoryTheory.MonoidalCategory.MonoidalLeftAction C D'} [self : F.LeftLinear C] (c : C) (d : D),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Functor.LaxLeftLinear.μₗ F c d)
      (CategoryTheory.Functor.OplaxLeftLinear.δₗ F c d) =
    CategoryTheory.CategoryStruct.id (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionObj c (F.obj d))