∀ {α : Type u_1} {F : Type u_3} [inst : NormedAddCommGroup F] [inst_1 : NormedSpace ℝ F] {m : MeasurableSpace α}
  {μ : MeasureTheory.Measure α} (s t : Set α),
  μ s = μ t → MeasureTheory.weightedSMul μ s = MeasureTheory.weightedSMul μ t