∀ {𝕜 : Type u_1} {E : Type u_2} {F : Type u_3} [inst : Semiring 𝕜] [inst_1 : AddCommMonoid E] [inst_2 : Module 𝕜 E]
  [inst_3 : TopologicalSpace E] [inst_4 : ContinuousAdd E] [inst_5 : ContinuousConstSMul 𝕜 E] [inst_6 : AddCommMonoid F]
  [inst_7 : Module 𝕜 F] [inst_8 : TopologicalSpace F] [inst_9 : ContinuousAdd F] [inst_10 : ContinuousConstSMul 𝕜 F]
  (𝕜' : Type u_4) [inst_11 : Semiring 𝕜'] [inst_12 : Module 𝕜' F] [inst_13 : ContinuousConstSMul 𝕜' F]
  [inst_14 : SMulCommClass 𝕜 𝕜' F] (r s : 𝕜') (x : FormalMultilinearSeries 𝕜 E F), (r + s) • x = r • x + s • x