∀ (K : Type u_1) [inst : NontriviallyNormedField K] (L : Type u_2) [inst_1 : Field L] [inst_2 : Algebra K L]
  [Algebra.IsAlgebraic K L] [hu : IsUltrametricDist K] (x y : L), spectralNorm K L (x - y) = spectralNorm K L (-x + y)