∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.MonoidalCategory C] {X₁ Y₁ X₂ Y₂ : C}
  (f : X₁ ⟶ Y₁) (g : X₂ ⟶ Y₂),
  CategoryTheory.MonoidalCategoryStruct.tensorHom f g =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.whiskerLeft X₁ g)
      (CategoryTheory.MonoidalCategoryStruct.whiskerRight f Y₂)