∀ {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}
  (δ : CategoryTheory.MonoidalCategory.curriedTensorPost F ⟶ CategoryTheory.MonoidalCategory.curriedTensorPre F),
  CategoryTheory.Functor.OplaxMonoidal.ofBifunctor.firstMap δ =
      CategoryTheory.Functor.OplaxMonoidal.ofBifunctor.secondMap δ →
    ∀ (X Y Z : C),
      (((CategoryTheory.Functor.OplaxMonoidal.ofBifunctor.firstMap δ).app X).app Y).app Z =
        (((CategoryTheory.Functor.OplaxMonoidal.ofBifunctor.secondMap δ).app X).app Y).app Z