∀ {α : Type u_1} {γ : Type u_2} {𝕜 : Type u_3} [inst : NormedField 𝕜] [inst_1 : TopologicalSpace α]
  [inst_2 : NormedRing γ] [inst_3 : NormedAlgebra 𝕜 γ] (a : 𝕜) (b : BoundedContinuousFunction α γ), ‖a • b‖ ≤ ‖a‖ * ‖b‖