∀ {α : Type u_1} {β : Type u_2} [inst : MeasurableSpace α] [inst_1 : MeasurableSpace β] {f : α → β}
  {μa : autoParam (MeasureTheory.Measure α) MeasureTheory.MeasurePreserving._auto_1}
  {μb : autoParam (MeasureTheory.Measure β) MeasureTheory.MeasurePreserving._auto_3},
  MeasureTheory.MeasurePreserving f μa μb → Measurable f