∀ (𝕜 : Type u_3) (E : Type u_1) (Fₗ : Type u_2) [inst : SeminormedAddCommGroup E] [inst_1 : SeminormedAddCommGroup Fₗ]
  [inst_2 : NontriviallyNormedField 𝕜] [inst_3 : NormedSpace 𝕜 E] [inst_4 : NormedSpace 𝕜 Fₗ] (c₁ c₂ : StrongDual 𝕜 E),
  ContinuousLinearMap.smulRightₗ (c₁ + c₂) = ContinuousLinearMap.smulRightₗ c₁ + ContinuousLinearMap.smulRightₗ c₂