Theorem: CategoryTheory.GradedObject.ι_mapBifunctorLeftUnitor_hom_apply
File: Mathlib/CategoryTheory/GradedObject/Unitor.lean

Proof steps:
state_before: C : Type u_1
D : Type u_2
I : Type u_3
J : Type u_4
inst✝⁷ : Category.{u_6, u_1} C
inst✝⁶ : Category.{u_5, u_2} D
inst✝⁵ : Zero I
inst✝⁴ : DecidableEq I
inst✝³ : HasInitial C
F : C ⥤ D ⥤ D
X : C
e : F.obj X ≅ 𝟭 D
inst✝² : (Y : D) → PreservesColimit (Functor.empty C) (F.flip.obj Y)
p : I × J → J
hp : ∀ (j : J), p (0, j) = j
Y Y' : GradedObject J D
φ : Y ⟶ Y'
inst✝¹ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y).HasMap p
inst✝ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y').HasMap p
j : J
⊢ ιMapBifunctorMapObj F p ((single₀ I).obj X) Y 0 j j ⋯ ≫ (mapBifunctorLeftUnitor F X e p hp Y).hom j =
    (F.map (singleObjApplyIso 0 X).hom).app (Y j) ≫ e.hom.app (Y j)
state_after: C : Type u_1
D : Type u_2
I : Type u_3
J : Type u_4
inst✝⁷ : Category.{u_6, u_1} C
inst✝⁶ : Category.{u_5, u_2} D
inst✝⁵ : Zero I
inst✝⁴ : DecidableEq I
inst✝³ : HasInitial C
F : C ⥤ D ⥤ D
X : C
e : F.obj X ≅ 𝟭 D
inst✝² : (Y : D) → PreservesColimit (Functor.empty C) (F.flip.obj Y)
p : I × J → J
hp : ∀ (j : J), p (0, j) = j
Y Y' : GradedObject J D
φ : Y ⟶ Y'
inst✝¹ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y).HasMap p
inst✝ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y').HasMap p
j : J
⊢ ιMapBifunctorMapObj F p ((single₀ I).obj X) Y 0 j j ⋯ ≫
      (CofanMapObjFun.iso (mapBifunctorLeftUnitorCofanIsColimit F X e p hp Y j)).inv =
    (F.map (singleObjApplyIso 0 X).hom).app (Y j) ≫ e.hom.app (Y j)
tactic: dsimp [mapBifunctorLeftUnitor]
state_before: C : Type u_1
D : Type u_2
I : Type u_3
J : Type u_4
inst✝⁷ : Category.{u_6, u_1} C
inst✝⁶ : Category.{u_5, u_2} D
inst✝⁵ : Zero I
inst✝⁴ : DecidableEq I
inst✝³ : HasInitial C
F : C ⥤ D ⥤ D
X : C
e : F.obj X ≅ 𝟭 D
inst✝² : (Y : D) → PreservesColimit (Functor.empty C) (F.flip.obj Y)
p : I × J → J
hp : ∀ (j : J), p (0, j) = j
Y Y' : GradedObject J D
φ : Y ⟶ Y'
inst✝¹ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y).HasMap p
inst✝ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y').HasMap p
j : J
⊢ ιMapBifunctorMapObj F p ((single₀ I).obj X) Y 0 j j ⋯ ≫
      (CofanMapObjFun.iso (mapBifunctorLeftUnitorCofanIsColimit F X e p hp Y j)).inv =
    (F.map (singleObjApplyIso 0 X).hom).app (Y j) ≫ e.hom.app (Y j)
state_after: C : Type u_1
D : Type u_2
I : Type u_3
J : Type u_4
inst✝⁷ : Category.{u_6, u_1} C
inst✝⁶ : Category.{u_5, u_2} D
inst✝⁵ : Zero I
inst✝⁴ : DecidableEq I
inst✝³ : HasInitial C
F : C ⥤ D ⥤ D
X : C
e : F.obj X ≅ 𝟭 D
inst✝² : (Y : D) → PreservesColimit (Functor.empty C) (F.flip.obj Y)
p : I × J → J
hp : ∀ (j : J), p (0, j) = j
Y Y' : GradedObject J D
φ : Y ⟶ Y'
inst✝¹ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y).HasMap p
inst✝ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y').HasMap p
j : J
⊢ Cofan.inj (mapBifunctorLeftUnitorCofan F X e p hp Y j) ⟨(0, j), ⋯⟩ =
    (F.map (singleObjApplyIso 0 X).hom).app (Y j) ≫ e.hom.app (Y j)
tactic: erw [CofanMapObjFun.ιMapObj_iso_inv]
state_before: C : Type u_1
D : Type u_2
I : Type u_3
J : Type u_4
inst✝⁷ : Category.{u_6, u_1} C
inst✝⁶ : Category.{u_5, u_2} D
inst✝⁵ : Zero I
inst✝⁴ : DecidableEq I
inst✝³ : HasInitial C
F : C ⥤ D ⥤ D
X : C
e : F.obj X ≅ 𝟭 D
inst✝² : (Y : D) → PreservesColimit (Functor.empty C) (F.flip.obj Y)
p : I × J → J
hp : ∀ (j : J), p (0, j) = j
Y Y' : GradedObject J D
φ : Y ⟶ Y'
inst✝¹ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y).HasMap p
inst✝ : (((mapBifunctor F I J).obj ((single₀ I).obj X)).obj Y').HasMap p
j : J
⊢ Cofan.inj (mapBifunctorLeftUnitorCofan F X e p hp Y j) ⟨(0, j), ⋯⟩ =
    (F.map (singleObjApplyIso 0 X).hom).app (Y j) ≫ e.hom.app (Y j)
state_after: no goals
tactic: rw [mapBifunctorLeftUnitorCofan_inj]