∀ {α : Type u_1} {β : Type u_2} {γ : Type u_3} [inst : TopologicalSpace α] [inst_1 : TopologicalSpace β]
  [inst_2 : TopologicalSpace γ] [inst_3 : AddGroup γ] [inst_4 : IsTopologicalAddGroup γ] (f : C(β, γ)) (z : ℤ)
  (g : C(α, β)), (z • f).comp g = z • f.comp g