∀ {ι : Type u_1} {V : Type u_2} [inst : CategoryTheory.Category.{v_1, u_2} V] {c : ComplexShape ι}
  [inst_1 : CategoryTheory.Limits.HasZeroMorphisms V] (X : HomologicalComplex V c.symm) (i : ι),
  X.opSymm.X i = Opposite.op (X.X i)