∀ {K : Type u_1} [inst : NormedField K] {L : Type u_2} [inst_1 : Field L] [inst_2 : Algebra K L]
  [h_fin : FiniteDimensional K L] [hu : IsUltrametricDist K] (σ : Gal(L/K)),
  IsNonarchimedean ⇑(IsUltrametricDist.algNormOfAlgEquiv σ)