∀ {E : Type u_4} [inst : NormedAddCommGroup E] [inst_1 : CompleteSpace E] [inst_2 : InnerProductSpace ℝ E]
  {mE : MeasurableSpace E} {μ : MeasureTheory.Measure E} (L : StrongDual ℝ E),
  MeasureTheory.charFun μ ((InnerProductSpace.toDual ℝ E).symm L) = MeasureTheory.charFunDual μ L