∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.CartesianMonoidalCategory C]
  (X Y : C),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.CartesianMonoidalCategory.lift (CategoryTheory.SemiCartesianMonoidalCategory.snd X Y)
        (CategoryTheory.SemiCartesianMonoidalCategory.fst X Y))
      (CategoryTheory.CartesianMonoidalCategory.lift (CategoryTheory.SemiCartesianMonoidalCategory.snd Y X)
        (CategoryTheory.SemiCartesianMonoidalCategory.fst Y X)) =
    CategoryTheory.CategoryStruct.id (CategoryTheory.MonoidalCategoryStruct.tensorObj X Y)