Theorem: CategoryTheory.ProjectiveResolution.fromLeftDerivedZero_eq
File: Mathlib/CategoryTheory/Abelian/LeftDerived.lean

tactic: dsimp [Functor.fromLeftDerivedZero, isoLeftDerivedObj]
state_before: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
⊢ F.fromLeftDerivedZero.app X =
    (P.isoLeftDerivedObj F 0).hom ≫
      (ChainComplex.isoHomologyι₀ ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)).hom ≫
        P.fromLeftDerivedZero' F
state_after: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
⊢ (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
        (projectiveResolution X).fromLeftDerivedZero' F =
    ((HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map (P.isoLeftDerivedToHomotopyCategoryObj F).hom ≫
        (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex).homologyι 0 ≫ P.fromLeftDerivedZero' F

tactic: have h₁ := ProjectiveResolution.fromLeftDerivedZero'_naturality
  (𝟙 X) P (projectiveResolution X) (lift (𝟙 X) _ _) (by simp) F
state_before: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
⊢ (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
        (projectiveResolution X).fromLeftDerivedZero' F =
    ((HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map (P.isoLeftDerivedToHomotopyCategoryObj F).hom ≫
        (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex).homologyι 0 ≫ P.fromLeftDerivedZero' F
state_after: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F ≫ F.map (𝟙 X)
⊢ (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
        (projectiveResolution X).fromLeftDerivedZero' F =
    ((HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map (P.isoLeftDerivedToHomotopyCategoryObj F).hom ≫
        (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex).homologyι 0 ≫ P.fromLeftDerivedZero' F

tactic: have h₂ : (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
  (F.mapHomologicalComplex _ ⋙ HomotopyCategory.quotient _ _).map (lift (𝟙 X) _ _) :=
    id_comp _
state_before: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F ≫ F.map (𝟙 X)
⊢ (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
        (projectiveResolution X).fromLeftDerivedZero' F =
    ((HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map (P.isoLeftDerivedToHomotopyCategoryObj F).hom ≫
        (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex).homologyι 0 ≫ P.fromLeftDerivedZero' F
state_after: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F ≫ F.map (𝟙 X)
h₂ :
  (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
    (F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
      (lift (𝟙 X) P (projectiveResolution X))
⊢ (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
        (projectiveResolution X).fromLeftDerivedZero' F =
    ((HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map (P.isoLeftDerivedToHomotopyCategoryObj F).hom ≫
        (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex).homologyι 0 ≫ P.fromLeftDerivedZero' F

tactic: simp only [Functor.map_id, comp_id] at h₁
state_before: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F ≫ F.map (𝟙 X)
h₂ :
  (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
    (F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
      (lift (𝟙 X) P (projectiveResolution X))
⊢ (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
        (projectiveResolution X).fromLeftDerivedZero' F =
    ((HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map (P.isoLeftDerivedToHomotopyCategoryObj F).hom ≫
        (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex).homologyι 0 ≫ P.fromLeftDerivedZero' F
state_after: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₂ :
  (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
    (F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
      (lift (𝟙 X) P (projectiveResolution X))
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F
⊢ (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
        (projectiveResolution X).fromLeftDerivedZero' F =
    ((HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map (P.isoLeftDerivedToHomotopyCategoryObj F).hom ≫
        (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex).homologyι 0 ≫ P.fromLeftDerivedZero' F

tactic: rw [assoc, ← cancel_epi ((HomotopyCategory.homologyFunctor _ _ 0).map
    (P.isoLeftDerivedToHomotopyCategoryObj F).inv), ← Functor.map_comp_assoc,
    Iso.inv_hom_id, Functor.map_id, id_comp, ← h₁, h₂,
    ← HomologicalComplex.homologyι_naturality_assoc]
state_before: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₂ :
  (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
    (F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
      (lift (𝟙 X) P (projectiveResolution X))
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F
⊢ (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
        (projectiveResolution X).fromLeftDerivedZero' F =
    ((HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map (P.isoLeftDerivedToHomotopyCategoryObj F).hom ≫
        (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex)) ≫
      ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex).homologyι 0 ≫ P.fromLeftDerivedZero' F
state_after: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₂ :
  (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
    (F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
      (lift (𝟙 X) P (projectiveResolution X))
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F
⊢ (HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map
        ((F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
          (lift (𝟙 X) P (projectiveResolution X))) ≫
      (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
          (projectiveResolution X).fromLeftDerivedZero' F =
    (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex) ≫
      HomologicalComplex.homologyMap
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj (projectiveResolution X).complex).homologyι 0 ≫
          (projectiveResolution X).fromLeftDerivedZero' F

tactic: erw [← NatTrans.naturality_assoc]
state_before: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₂ :
  (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
    (F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
      (lift (𝟙 X) P (projectiveResolution X))
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F
⊢ (HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map
        ((F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
          (lift (𝟙 X) P (projectiveResolution X))) ≫
      (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
          (projectiveResolution X).fromLeftDerivedZero' F =
    (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj P.complex) ≫
      HomologicalComplex.homologyMap
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj (projectiveResolution X).complex).homologyι 0 ≫
          (projectiveResolution X).fromLeftDerivedZero' F
state_after: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₂ :
  (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
    (F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
      (lift (𝟙 X) P (projectiveResolution X))
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F
⊢ (HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map
        ((F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
          (lift (𝟙 X) P (projectiveResolution X))) ≫
      (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
          (projectiveResolution X).fromLeftDerivedZero' F =
    (HomotopyCategory.quotient D (ComplexShape.down ℕ) ⋙ HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) ≫
      (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj (projectiveResolution X).complex) ≫
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj (projectiveResolution X).complex).homologyι 0 ≫
          (projectiveResolution X).fromLeftDerivedZero' F

tactic: rfl
state_before: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
h₂ :
  (P.isoLeftDerivedToHomotopyCategoryObj F).inv =
    (F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
      (lift (𝟙 X) P (projectiveResolution X))
h₁ :
  HomologicalComplex.opcyclesMap
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) 0 ≫
      (projectiveResolution X).fromLeftDerivedZero' F =
    P.fromLeftDerivedZero' F
⊢ (HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map
        ((F.mapHomologicalComplex (ComplexShape.down ℕ) ⋙ HomotopyCategory.quotient D (ComplexShape.down ℕ)).map
          (lift (𝟙 X) P (projectiveResolution X))) ≫
      (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as) ≫
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj ((projectiveResolutions C).obj X).as).homologyι 0 ≫
          (projectiveResolution X).fromLeftDerivedZero' F =
    (HomotopyCategory.quotient D (ComplexShape.down ℕ) ⋙ HomotopyCategory.homologyFunctor D (ComplexShape.down ℕ) 0).map
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).map (lift (𝟙 X) P (projectiveResolution X))) ≫
      (HomotopyCategory.homologyFunctorFactors D (ComplexShape.down ℕ) 0).hom.app
          ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj (projectiveResolution X).complex) ≫
        ((F.mapHomologicalComplex (ComplexShape.down ℕ)).obj (projectiveResolution X).complex).homologyι 0 ≫
          (projectiveResolution X).fromLeftDerivedZero' F
state_after: no goals

tactic: simp
state_before: C : Type u
inst✝⁵ : Category.{v, u} C
D : Type u_1
inst✝⁴ : Category.{u_2, u_1} D
inst✝³ : Abelian C
inst✝² : HasProjectiveResolutions C
inst✝¹ : Abelian D
X : C
P : ProjectiveResolution X
F : C ⥤ D
inst✝ : F.Additive
⊢ (lift (𝟙 X) P (projectiveResolution X)).f 0 ≫ (projectiveResolution X).π.f 0 = P.π.f 0 ≫ 𝟙 X
state_after: no goals