{ι : Type u_1} →
  {c : ComplexShape ι} →
    {C : Type u_3} →
      [inst : CategoryTheory.Category.{v_1, u_3} C] →
        [inst_1 : CategoryTheory.Limits.HasZeroObject C] →
          [inst_2 : CategoryTheory.Limits.HasZeroMorphisms C] →
            (K : HomologicalComplex C c) →
              {i : Option ι} → {j : ι} → i = some j → (HomologicalComplex.extend.X K i ≅ K.X j)