∀ {𝕜 : Type u_1} {A : Type u_2} [inst : CommRing 𝕜] [inst_1 : TopologicalSpace 𝕜] [inst_2 : ContinuousAdd 𝕜]
  [inst_3 : ContinuousConstSMul 𝕜 𝕜] [inst_4 : TopologicalSpace A] [inst_5 : Semiring A] [inst_6 : Algebra 𝕜 A]
  (φ : ↑(WeakDual.characterSpace 𝕜 A)), (WeakDual.CharacterSpace.toNonUnitalAlgHom φ).toFun 0 = 0