-- Lean 4 proof step from Mathlib.Algebra.Homology.BifunctorShift (goal)
Goal:
C₁ : Type u_1
C₂ : Type u_2
D : Type u_3
inst : Category.{v_1, u_1} C₁
inst_1 : Category.{v_2, u_2} C₂
inst_2 : Category.{v_3, u_3} D
inst_3 : Preadditive.{v_1, u_1} C₁
inst_4 : Preadditive.{v_2, u_2} C₂
inst_5 : Preadditive.{v_3, u_3} D
K₁ : CochainComplex.{v_1, u_1, 0} C₁ ℤ
K₂ : CochainComplex.{v_2, u_2, 0} C₂ ℤ
F : C₁ ⥤ CategoryTheory.Functor.{v_2, v_3, u_2, u_3} C₂ D
inst_6 : F.Additive
inst_7 : ∀ (X₁ : C₁), (F.obj X₁).Additive
x y : ℤ
inst_8 : K₁.HasMapBifunctor K₂ F
⊢ Eq (α :=
    Quiver.Hom (V := CochainComplex.{v_3, u_3, 0} D ℤ)
      ((Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁).mapBifunctor
        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂) F)
      (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) x)
        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) y) (K₁.mapBifunctor K₂ F))))
    (CategoryStruct.comp (Y :=
        HomologicalComplex₂.total
          (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x ⋙ HomologicalComplex₂.shiftFunctor₂ D y)
            (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
              K₂))
          (ComplexShape.up ℤ))
        (HomologicalComplex₂.total.map
            (CategoryStruct.comp (Y :=
              Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)))
              (CategoryStruct.comp (Y :=
                  Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                    (Functor.obj
                      (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                      (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂)))
                  (Iso.hom
                      (K₁.mapBifunctorHomologicalComplexShift₁Iso
                        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂) F x) :
                    Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                      (Functor.obj
                        (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                          (Functor.obj
                            (CategoryTheory.shiftFunctor (HomologicalComplex.{v_1, u_1, 0} C₁ (ComplexShape.up ℤ)) x)
                            K₁))
                        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))
                      (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                        (Functor.obj
                          (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                          (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))))
                  (CategoryTheory.Functor.map (HomologicalComplex₂.shiftFunctor₁ D x)
                      (Iso.hom (K₁.mapBifunctorHomologicalComplexShift₂Iso K₂ F y)) :
                    Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                      (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                        (Functor.obj
                          (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                          (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂)))
                      (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                        (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                          (Functor.obj
                            (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                            K₂)))) :
                Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                      (Functor.obj
                        (CategoryTheory.shiftFunctor (HomologicalComplex.{v_1, u_1, 0} C₁ (ComplexShape.up ℤ)) x) K₁))
                    (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))
                  (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                    (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                      (Functor.obj
                        (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                        K₂))))
              (NatTrans.app (Iso.hom (HomologicalComplex₂.shiftFunctor₁₂CommIso D x y))
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂) :
                Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                  (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y ⋙ HomologicalComplex₂.shiftFunctor₁ D x)
                    (Functor.obj
                      (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂))
                  (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x ⋙ HomologicalComplex₂.shiftFunctor₂ D y)
                    (Functor.obj
                      (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂))))
            (ComplexShape.up ℤ) :
          Quiver.Hom (V := HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ))
            (HomologicalComplex₂.total
              (Functor.obj
                (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                  (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_1, u_1, 0} C₁ (ComplexShape.up ℤ)) x)
                    K₁))
                (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))
              (ComplexShape.up ℤ))
            (HomologicalComplex₂.total
              (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x ⋙ HomologicalComplex₂.shiftFunctor₂ D y)
                (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                  K₂))
              (ComplexShape.up ℤ)))
        (CategoryStruct.comp (Y :=
            Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ)) y)
              (HomologicalComplex₂.total
                (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂))
                (ComplexShape.up ℤ)))
            (Iso.hom
              (HomologicalComplex₂.totalShift₂Iso
                (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂))
                y))
            (CategoryTheory.Functor.map
                (CategoryTheory.shiftFunctor (HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ)) y)
                (Iso.hom
                  (HomologicalComplex₂.totalShift₁Iso
                    (Functor.obj
                      (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)
                    x)) ≫
              NatTrans.app (Iso.hom (shiftFunctorComm (CochainComplex.{v_3, u_3, 0} D ℤ) x y))
                (HomologicalComplex₂.total
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)
                  (ComplexShape.up ℤ))) :
          Quiver.Hom (V := HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ))
            (HomologicalComplex₂.total
              (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x ⋙ HomologicalComplex₂.shiftFunctor₂ D y)
                (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                  K₂))
              (ComplexShape.up ℤ))
            (Functor.obj
              (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) y ⋙
                CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) x)
              (HomologicalComplex₂.total
                (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                  K₂)
                (ComplexShape.up ℤ)))) :
      Quiver.Hom (V := HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ))
        (HomologicalComplex₂.total
          (Functor.obj
            (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
              (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_1, u_1, 0} C₁ (ComplexShape.up ℤ)) x)
                K₁))
            (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))
          (ComplexShape.up ℤ))
        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) x)
          (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) y) (K₁.mapBifunctor K₂ F))))
    (CategoryStruct.comp (Y :=
        HomologicalComplex₂.total
          (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
            (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
              (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                K₂)))
          (ComplexShape.up ℤ))
        (HomologicalComplex₂.total.map
            (CategoryStruct.comp (Y :=
              Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                (Functor.obj
                  (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                    (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
                  K₂))
              (Iso.hom
                  ((Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x)
                        K₁).mapBifunctorHomologicalComplexShift₂Iso
                    K₂ F y) :
                Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                      (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
                    (Functor.obj
                      (CategoryTheory.shiftFunctor (HomologicalComplex.{v_2, u_2, 0} C₂ (ComplexShape.up ℤ)) y) K₂))
                  (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                    (Functor.obj
                      (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
                      K₂)))
              (CategoryTheory.Functor.map (HomologicalComplex₂.shiftFunctor₂ D y)
                  (Iso.hom (K₁.mapBifunctorHomologicalComplexShift₁Iso K₂ F x)) :
                Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                  (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                    (Functor.obj
                      (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
                      K₂))
                  (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                    (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                      (Functor.obj
                        (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                        K₂)))))
            (ComplexShape.up ℤ) :
          Quiver.Hom (V := HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ))
            (HomologicalComplex₂.total
              (Functor.obj
                (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                  (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
                (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_2, u_2, 0} C₂ (ComplexShape.up ℤ)) y)
                  K₂))
              (ComplexShape.up ℤ))
            (HomologicalComplex₂.total
              (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)))
              (ComplexShape.up ℤ)))
        (CategoryStruct.comp (Y :=
            Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ)) y)
              (HomologicalComplex₂.total
                (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂))
                (ComplexShape.up ℤ)))
            (Iso.hom
              (HomologicalComplex₂.totalShift₂Iso
                (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂))
                y))
            (CategoryTheory.Functor.map (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) y)
                (Iso.hom
                  (HomologicalComplex₂.totalShift₁Iso
                    (Functor.obj
                      (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)
                    x)) ≫
              NatTrans.app (Iso.hom (shiftFunctorComm (CochainComplex.{v_3, u_3, 0} D ℤ) x y)) (K₁.mapBifunctor K₂ F)) :
          Quiver.Hom (V := HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ))
            (HomologicalComplex₂.total
              (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)))
              (ComplexShape.up ℤ))
            (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) x)
              (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) y)
                (K₁.mapBifunctor K₂ F)))) :
      Quiver.Hom (V := HomologicalComplex.{v_3, u_3, 0} D (ComplexShape.up ℤ))
        (HomologicalComplex₂.total
          (Functor.obj
            (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
              (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
            (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_2, u_2, 0} C₂ (ComplexShape.up ℤ)) y) K₂))
          (ComplexShape.up ℤ))
        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) x)
          (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_3, u_3, 0} D ℤ) y) (K₁.mapBifunctor K₂ F))))
have w : Eq (α :=
  Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
    (Functor.obj
      (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
        (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_1, u_1, 0} C₁ (ComplexShape.up ℤ)) x) K₁))
      (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))
    (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x ⋙ HomologicalComplex₂.shiftFunctor₂ D y)
      (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)))
  (CategoryStruct.comp (Y :=
      Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
        (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
          (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)))
      (CategoryStruct.comp (Y :=
          Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
            (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
              (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂)))
          (Iso.hom
              (K₁.mapBifunctorHomologicalComplexShift₁Iso
                (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂) F x) :
            Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
              (Functor.obj
                (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                  (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_1, u_1, 0} C₁ (ComplexShape.up ℤ)) x)
                    K₁))
                (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))
              (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                  (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))))
          (CategoryTheory.Functor.map (HomologicalComplex₂.shiftFunctor₁ D x)
              (Iso.hom (K₁.mapBifunctorHomologicalComplexShift₂Iso K₂ F y)) :
            Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
              (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                  (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂)))
              (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
                (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
                  (Functor.obj
                    (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)))) :
        Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
          (Functor.obj
            (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
              (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_1, u_1, 0} C₁ (ComplexShape.up ℤ)) x)
                K₁))
            (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))
          (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
            (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
              (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                K₂))))
      (NatTrans.app (Iso.hom (HomologicalComplex₂.shiftFunctor₁₂CommIso D x y))
          (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂) :
        Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
          (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y ⋙ HomologicalComplex₂.shiftFunctor₁ D x)
            (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
              K₂))
          (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x ⋙ HomologicalComplex₂.shiftFunctor₂ D y)
            (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
              K₂))) :
    Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
      (Functor.obj
        (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
          (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_1, u_1, 0} C₁ (ComplexShape.up ℤ)) x) K₁))
        (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_2, u_2, 0} C₂ ℤ) y) K₂))
      (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x ⋙ HomologicalComplex₂.shiftFunctor₂ D y)
        (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁) K₂)))
  (CategoryStruct.comp (Y :=
      Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
        (Functor.obj
          (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
            (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
          K₂))
      (Iso.hom
          ((Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x)
                K₁).mapBifunctorHomologicalComplexShift₂Iso
            K₂ F y) :
        Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
          (Functor.obj
            (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
              (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
            (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_2, u_2, 0} C₂ (ComplexShape.up ℤ)) y) K₂))
          (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
            (Functor.obj
              (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
              K₂)))
      (CategoryTheory.Functor.map (HomologicalComplex₂.shiftFunctor₂ D y)
          (Iso.hom (K₁.mapBifunctorHomologicalComplexShift₁Iso K₂ F x)) :
        Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
          (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
            (Functor.obj
              (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
                (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
              K₂))
          (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
            (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
              (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
                K₂)))) :
    Quiver.Hom (V := HomologicalComplex₂.{v_3, u_3, 0, 0} D (ComplexShape.up ℤ) (ComplexShape.up ℤ))
      (Functor.obj
        (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ))
          (Functor.obj (CategoryTheory.shiftFunctor (CochainComplex.{v_1, u_1, 0} C₁ ℤ) x) K₁))
        (Functor.obj (CategoryTheory.shiftFunctor (HomologicalComplex.{v_2, u_2, 0} C₂ (ComplexShape.up ℤ)) y) K₂))
      (Functor.obj (HomologicalComplex₂.shiftFunctor₂ D y)
        (Functor.obj (HomologicalComplex₂.shiftFunctor₁ D x)
          (Functor.obj (Functor.obj (F.mapBifunctorHomologicalComplex (ComplexShape.up ℤ) (ComplexShape.up ℤ)) K₁)
            K₂))))
Tactic: congr 2