∀ {C : Type u_1} [inst : CategoryTheory.Category.{u_2, u_1} C] [inst_1 : CategoryTheory.Abelian C]
  (Φ Ψ : CategoryTheory.Abelian.Preradical C),
  CategoryTheory.CategoryStruct.comp (Φ.toColon Ψ).hom.left (Φ.colonπ Ψ) = 0