∀ {C : Type u_1} {ι : Type u_2} [inst : CategoryTheory.Category.{v_1, u_1} C]
  [inst_1 : CategoryTheory.Category.{v_2, u_2} ι] [inst_2 : CategoryTheory.Abelian C]
  (X : CategoryTheory.Abelian.SpectralObject C ι) {i j k : ι} (f : i ⟶ j) (g : j ⟶ k) (fg : i ⟶ k)
  (h : CategoryTheory.CategoryStruct.comp f g = fg) (n : ℤ) {Z : C}
  (h_1 : (X.H n).obj (CategoryTheory.ComposableArrows.mk₁ fg) ⟶ Z),
  CategoryTheory.CategoryStruct.comp (X.pOpcycles f g n)
      (CategoryTheory.CategoryStruct.comp (X.opcyclesIsoKernel f g fg h n).hom
        (CategoryTheory.CategoryStruct.comp
          (CategoryTheory.Limits.kernel.ι ((X.H n).map (CategoryTheory.ComposableArrows.twoδ₁Toδ₀ f g fg h))) h_1)) =
    CategoryTheory.CategoryStruct.comp ((X.H n).map (CategoryTheory.ComposableArrows.twoδ₂Toδ₁ f g fg h)) h_1