∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.CartesianMonoidalCategory C]
  [inst_2 : CategoryTheory.BraidedCategory C] (X : CategoryTheory.Grp C),
  (CategoryTheory.MonoidalCategoryStruct.leftUnitor ((CategoryTheory.Grp.forget₂Mon C).obj X)).inv =
    CategoryTheory.CategoryStruct.comp
      ((CategoryTheory.Grp.forget₂Mon C).map (CategoryTheory.MonoidalCategoryStruct.leftUnitor X).inv)
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.CategoryStruct.id
          ((CategoryTheory.Grp.forget₂Mon C).obj
            (CategoryTheory.MonoidalCategoryStruct.tensorObj
              (CategoryTheory.MonoidalCategoryStruct.tensorUnit (CategoryTheory.Grp C)) X)))
        (CategoryTheory.MonoidalCategoryStruct.whiskerRight
          (CategoryTheory.CategoryStruct.id
            ((CategoryTheory.Grp.forget₂Mon C).obj
              (CategoryTheory.MonoidalCategoryStruct.tensorUnit (CategoryTheory.Grp C))))
          ((CategoryTheory.Grp.forget₂Mon C).obj X)))