∀ (C : Type u₁) [inst : CategoryTheory.Category.{v₁, u₁} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  (X Y : Cᴹᵒᵖᴹᵒᵖ),
  CategoryTheory.Functor.OplaxMonoidal.δ (CategoryTheory.MonoidalOpposite.mopMopEquivalence C).functor X Y =
    CategoryTheory.CategoryStruct.id (CategoryTheory.MonoidalCategoryStruct.tensorObj X.unmop.unmop Y.unmop.unmop)