∀ {Ω : Type u_1} {ι : Type u_2} {m : MeasurableSpace Ω} [inst : Preorder ι] {f : MeasureTheory.Filtration ι m}
  {β : ι → Type u_3} [inst_1 : (i : ι) → MeasurableSpace (β i)] {u v : (i : ι) → Ω → β i} [inst_2 : (i : ι) → Sub (β i)]
  [∀ (i : ι), MeasurableSub₂ (β i)],
  MeasureTheory.Adapted f u → MeasureTheory.Adapted f v → MeasureTheory.Adapted f (u - v)