∀ {α : Type u_1} {β : Type u_2} [inst : MeasurableSpace α] [inst_1 : MeasurableSpace β] {μa : MeasureTheory.Measure α}
  {μb : MeasureTheory.Measure β} {f : α → β}, MeasureTheory.MeasurePreserving f μa μb → AEMeasurable f μa