∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  [inst_2 : CategoryTheory.Limits.HasZeroObject C] {ι : Type u_1} [inst_3 : DecidableEq ι] (c : ComplexShape ι) (j : ι)
  (A : C),
  CategoryTheory.CategoryStruct.comp (HomologicalComplex.singleObjHomologySelfIso c j A).hom
      (HomologicalComplex.singleObjOpcyclesSelfIso c j A).hom =
    ((HomologicalComplex.single C c j).obj A).homologyι j