∀ (C : Type u) [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Preadditive C]
  [inst_2 : CategoryTheory.HasShift C ℤ] (T : CategoryTheory.Pretriangulated.Triangle C),
  (CategoryTheory.Pretriangulated.invRotate C).obj T = T.invRotate