∀ {E : Type u_1} [inst : MeasurableSpace E] {μ : MeasureTheory.Measure E} {Ω : Type u_2} {x : MeasurableSpace Ω}
  {ℙ : MeasureTheory.Measure Ω} {X : Ω → E} {s : Set E},
  MeasurableSet s →
    MeasureTheory.pdf.IsUniform X s ℙ μ →
      (fun x_1 => (MeasureTheory.pdf X ℙ μ x_1).toReal) =ᵐ[μ] fun x => (s.indicator ((μ s)⁻¹ • 1) x).toReal