Module: Mathlib.CategoryTheory.Comma.StructuredArrow.Basic

Goal state before:
pp: C : Type u₁
inst✝³ : Category.{v₁, u₁} C
D : Type u₂
inst✝² : Category.{v₂, u₂} D
T T' T'' : D
Y Y' Y'' : C
S S' : C ⥤ D
A : Type u₃
inst✝¹ : Category.{v₃, u₃} A
B : Type u₄
inst✝ : Category.{v₄, u₄} B
U : A ⥤ B
V : B
F✝ : C ⥤ A
G✝ : D ⥤ B
α✝ : F✝ ⋙ U ⟶ S ⋙ G✝
β✝ : G✝.obj T ⟶ V
F : C ≌ A
G : D ≌ B
α : F.functor ⋙ U ⟶ S ⋙ G.functor
α' : F.inverse ⋙ S ⟶ U ⋙ G.inverse
hα'α :
  S.leftUnitor.hom ≫ S.rightUnitor.inv ≫ S.whiskerLeft G.unitIso.hom ≫ (S.associator G.functor G.inverse).inv =
    Functor.whiskerRight F.unitIso.hom S ≫
      (F.functor.associator F.inverse S).hom ≫
        F.functor.whiskerLeft α' ≫ (F.functor.associator U G.inverse).inv ≫ Functor.whiskerRight α G.inverse
hαα' :
  F.inverse.whiskerLeft α ≫
      (F.inverse.associator S G.functor).inv ≫
        Functor.whiskerRight α' G.functor ≫ (U.associator G.inverse G.functor).hom ≫ U.whiskerLeft G.counitIso.hom =
    (F.inverse.associator F.functor U).inv ≫
      Functor.whiskerRight F.counitIso.hom U ≫ U.leftUnitor.hom ≫ U.rightUnitor.inv
β : G.functor.obj T ⟶ V
β' : G.inverse.obj V ⟶ T
hββ' : G.inverse.map β ≫ β' = G.unitIso.inv.app T
hβ'β : G.functor.map β' ≫ β = G.counitIso.hom.app V
⊢ G.functor.map β' ≫ β = G.counitIso.hom.app V ≫ 𝟙 ((𝟭 B).obj V)

pp: C : Type u₁
inst✝³ : Category.{v₁, u₁} C
D : Type u₂
inst✝² : Category.{v₂, u₂} D
T T' T'' : D
Y Y' Y'' : C
S S' : C ⥤ D
A : Type u₃
inst✝¹ : Category.{v₃, u₃} A
B : Type u₄
inst✝ : Category.{v₄, u₄} B
U : A ⥤ B
V : B
F✝ : C ⥤ A
G✝ : D ⥤ B
α✝ : F✝ ⋙ U ⟶ S ⋙ G✝
β✝ : G✝.obj T ⟶ V
F : C ≌ A
G : D ≌ B
α : F.functor ⋙ U ⟶ S ⋙ G.functor
α' : F.inverse ⋙ S ⟶ U ⋙ G.inverse
hα'α :
  S.leftUnitor.hom ≫ S.rightUnitor.inv ≫ S.whiskerLeft G.unitIso.hom ≫ (S.associator G.functor G.inverse).inv =
    Functor.whiskerRight F.unitIso.hom S ≫
      (F.functor.associator F.inverse S).hom ≫
        F.functor.whiskerLeft α' ≫ (F.functor.associator U G.inverse).inv ≫ Functor.whiskerRight α G.inverse
hαα' :
  F.inverse.whiskerLeft α ≫
      (F.inverse.associator S G.functor).inv ≫
        Functor.whiskerRight α' G.functor ≫ (U.associator G.inverse G.functor).hom ≫ U.whiskerLeft G.counitIso.hom =
    (F.inverse.associator F.functor U).inv ≫
      Functor.whiskerRight F.counitIso.hom U ≫ U.leftUnitor.hom ≫ U.rightUnitor.inv
β : G.functor.obj T ⟶ V
β' : G.inverse.obj V ⟶ T
hββ' : G.inverse.map β ≫ β' = G.unitIso.inv.app T
hβ'β : G.functor.map β' ≫ β = G.counitIso.hom.app V
⊢ ∀ (X : CostructuredArrow S T),
    (map₂ α β).map
          (((map₂IdIso (S.leftUnitor.hom ≫ S.rightUnitor.inv) T (𝟙 ((𝟭 D).obj T)) ⋯ ⋯).symm ≪≫
                  map₂Congr (S.leftUnitor.hom ≫ S.rightUnitor.inv) (𝟙 ((𝟭 D).obj T)) F.unitIso G.unitIso
                      ((F.functor.associator F.inverse S).hom ≫
                        F.functor.whiskerLeft α' ≫
                          (F.functor.associator U G.inverse).inv ≫
                            Functor.whiskerRight α G.inverse ≫ (S.associator G.functor G.inverse).hom)
                      (G.inverse.map β ≫ β') ?m.565 ?m.566 ≪≫
                    (map₂CompMap₂Iso α' β' α β).symm).hom.app
            X) ≫
        (map₂CompMap₂Iso α β α' β' ≪≫
                map₂Congr
                    ((F.inverse.associator F.functor U).hom ≫
                      F.inverse.whiskerLeft α ≫
                        (F.inverse.associator S G.functor).inv ≫
                          Functor.whiskerRight α' G.functor ≫ (U.associator G.inverse G.functor).hom)
                    (G.functor.map β' ≫ β) F.counitIso G.counitIso (U.leftUnitor.hom ≫ U.rightUnitor.inv)
                    (𝟙 ((𝟭 B).obj V)) ?m.661 ?m.662 ≪≫
                  map₂IdIso (U.leftUnitor.hom ≫ U.rightUnitor.inv) V (𝟙 ((𝟭 B).obj V)) ⋯ ⋯).hom.app
          ((map₂ α β).obj X) =
      𝟙 ((map₂ α β).obj X)

Tactic:
· simp [hβ'β]

Goal state after:
C : Type u₁
inst✝³ : Category.{v₁, u₁} C
D : Type u₂
inst✝² : Category.{v₂, u₂} D
T T' T'' : D
Y Y' Y'' : C
S S' : C ⥤ D
A : Type u₃
inst✝¹ : Category.{v₃, u₃} A
B : Type u₄
inst✝ : Category.{v₄, u₄} B
U : A ⥤ B
V : B
F✝ : C ⥤ A
G✝ : D ⥤ B
α✝ : F✝ ⋙ U ⟶ S ⋙ G✝
β✝ : G✝.obj T ⟶ V
F : C ≌ A
G : D ≌ B
α : F.functor ⋙ U ⟶ S ⋙ G.functor
α' : F.inverse ⋙ S ⟶ U ⋙ G.inverse
hα'α :
  S.leftUnitor.hom ≫ S.rightUnitor.inv ≫ S.whiskerLeft G.unitIso.hom ≫ (S.associator G.functor G.inverse).inv =
    Functor.whiskerRight F.unitIso.hom S ≫
      (F.functor.associator F.inverse S).hom ≫
        F.functor.whiskerLeft α' ≫ (F.functor.associator U G.inverse).inv ≫ Functor.whiskerRight α G.inverse
hαα' :
  F.inverse.whiskerLeft α ≫
      (F.inverse.associator S G.functor).inv ≫
        Functor.whiskerRight α' G.functor ≫ (U.associator G.inverse G.functor).hom ≫ U.whiskerLeft G.counitIso.hom =
    (F.inverse.associator F.functor U).inv ≫
      Functor.whiskerRight F.counitIso.hom U ≫ U.leftUnitor.hom ≫ U.rightUnitor.inv
β : G.functor.obj T ⟶ V
β' : G.inverse.obj V ⟶ T
hββ' : G.inverse.map β ≫ β' = G.unitIso.inv.app T
hβ'β : G.functor.map β' ≫ β = G.counitIso.hom.app V
⊢ ∀ (X : CostructuredArrow S T),
    (map₂ α β).map
          (((map₂IdIso (S.leftUnitor.hom ≫ S.rightUnitor.inv) T (𝟙 ((𝟭 D).obj T)) ⋯ ⋯).symm ≪≫
                  map₂Congr (S.leftUnitor.hom ≫ S.rightUnitor.inv) (𝟙 ((𝟭 D).obj T)) F.unitIso G.unitIso
                      ((F.functor.associator F.inverse S).hom ≫
                        F.functor.whiskerLeft α' ≫
                          (F.functor.associator U G.inverse).inv ≫
                            Functor.whiskerRight α G.inverse ≫ (S.associator G.functor G.inverse).hom)
                      (G.inverse.map β ≫ β') ?m.565 ?m.566 ≪≫
                    (map₂CompMap₂Iso α' β' α β).symm).hom.app
            X) ≫
        (map₂CompMap₂Iso α β α' β' ≪≫
                map₂Congr
                    ((F.inverse.associator F.functor U).hom ≫
                      F.inverse.whiskerLeft α ≫
                        (F.inverse.associator S G.functor).inv ≫
                          Functor.whiskerRight α' G.functor ≫ (U.associator G.inverse G.functor).hom)
                    (G.functor.map β' ≫ β) F.counitIso G.counitIso (U.leftUnitor.hom ≫ U.rightUnitor.inv)
                    (𝟙 ((𝟭 B).obj V)) ?m.661 ?m.662 ≪≫
                  map₂IdIso (U.leftUnitor.hom ≫ U.rightUnitor.inv) V (𝟙 ((𝟭 B).obj V)) ⋯ ⋯).hom.app
          ((map₂ α β).obj X) =
      𝟙 ((map₂ α β).obj X)