V : Type (u + 1)
inst✝¹ : LargeCategory V
G : MonCat
inst✝ : MonoidalCategory V
⊢ (Monoidal.fromTransported
              (CategoryTheory.Equivalence.symm (functorCategoryEquivalence V G))).toLaxMonoidalFunctor.ε.app
      PUnit.unit =
    𝟙 ((𝟙_ (SingleObj ↑G ⥤ V)).obj PUnit.unit)
V : Type (u + 1)
inst✝¹ : LargeCategory V
G : MonCat
inst✝ : MonoidalCategory V
⊢ (functorCategoryMonoidalEquivalence V G).toLaxMonoidalFunctor.ε.app PUnit.unit =
    𝟙 ((𝟙_ (SingleObj ↑G ⥤ V)).obj PUnit.unit)
dsimp only [functorCategoryMonoidalEquivalence]
V : Type (u + 1)
inst✝¹ : LargeCategory V
G : MonCat
inst✝ : MonoidalCategory V
⊢ ((Equivalence.unit (CategoryTheory.Equivalence.symm (functorCategoryEquivalence V G))).app
          (𝟙_ (SingleObj ↑G ⥤ V))).app
      PUnit.unit =
    𝟙 ((𝟙_ (SingleObj ↑G ⥤ V)).obj PUnit.unit)
V : Type (u + 1)
inst✝¹ : LargeCategory V
G : MonCat
inst✝ : MonoidalCategory V
⊢ (Monoidal.fromTransported
              (CategoryTheory.Equivalence.symm (functorCategoryEquivalence V G))).toLaxMonoidalFunctor.ε.app
      PUnit.unit =
    𝟙 ((𝟙_ (SingleObj ↑G ⥤ V)).obj PUnit.unit)
simp only [Monoidal.fromTransported_toLaxMonoidalFunctor_ε]
no goals
V : Type (u + 1)
inst✝¹ : LargeCategory V
G : MonCat
inst✝ : MonoidalCategory V
⊢ ((Equivalence.unit (CategoryTheory.Equivalence.symm (functorCategoryEquivalence V G))).app
          (𝟙_ (SingleObj ↑G ⥤ V))).app
      PUnit.unit =
    𝟙 ((𝟙_ (SingleObj ↑G ⥤ V)).obj PUnit.unit)
rfl