∀ {C : Type u_1} {D : Type u_2} [inst : CategoryTheory.Category.{v_1, u_1} C]
  [inst_1 : CategoryTheory.Category.{v_2, u_2} D] [inst_2 : CategoryTheory.HasShift C ℤ]
  [inst_3 : CategoryTheory.HasShift D ℤ] {F₁ F₂ : CategoryTheory.Functor C D} (e : F₁ ≅ F₂) [inst_4 : F₁.CommShift ℤ]
  [inst_5 : F₂.CommShift ℤ] [inst_6 : CategoryTheory.NatTrans.CommShift e.hom ℤ]
  (X : CategoryTheory.Pretriangulated.Triangle C),
  ((CategoryTheory.Functor.mapTriangleIso e).hom.app X).hom₃ = e.hom.app X.obj₃