∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.HasShift C ℤ]
  {T₁ T₂ : CategoryTheory.Pretriangulated.Triangle C} [inst_2 : CategoryTheory.Preadditive C]
  [∀ (n : ℤ), (CategoryTheory.shiftFunctor C n).Additive],
  CategoryTheory.CategoryStruct.comp T₁.mor₃ ((CategoryTheory.shiftFunctor C 1).map 0) =
    CategoryTheory.CategoryStruct.comp 0 T₂.mor₃