∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Preadditive C]
  {F G : CochainComplex C ℤ} {n : ℤ} (γ γ_1 : CochainComplex.HomComplex.Cochain F G n),
  γ = γ_1 → ∀ (p q : ℤ) (hpq : p + n = q), γ.v p q hpq = γ_1.v p q hpq