∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] [inst_1 : CategoryTheory.CartesianMonoidalCategory C]
  [inst_2 : CategoryTheory.BraidedCategory C] (G : CategoryTheory.Grp C),
  (CategoryTheory.MonoidalCategoryStruct.leftUnitor G).inv.hom.hom =
    (CategoryTheory.MonoidalCategoryStruct.leftUnitor G.X).inv