∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.MonoidalCategory C] {Y Y' : C}
  (i : Y ≅ Y'),
  CategoryTheory.monoidalComp
      (CategoryTheory.CategoryStruct.id
        (CategoryTheory.MonoidalCategoryStruct.tensorObj Y (CategoryTheory.MonoidalCategoryStruct.tensorUnit C)))
      (CategoryTheory.monoidalComp (CategoryTheory.CategoryStruct.comp i.hom i.inv)
        (CategoryTheory.CategoryStruct.id
          (CategoryTheory.MonoidalCategoryStruct.tensorObj (CategoryTheory.MonoidalCategoryStruct.tensorUnit C) Y))) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.rightUnitor Y).hom
      (CategoryTheory.MonoidalCategoryStruct.leftUnitor Y).inv