∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  [inst_2 : CategoryTheory.BraidedCategory C],
  CategoryTheory.Functor.OplaxMonoidal.η (CategoryTheory.unmopFunctor C) =
    CategoryTheory.CategoryStruct.id
      ((CategoryTheory.unmopFunctor C).obj (CategoryTheory.MonoidalCategoryStruct.tensorUnit Cᴹᵒᵖ))