∀ {α : Type u_1} {β : Type u_2} {γ : Type u_3} {m : MeasurableSpace α} [inst : Zero β] [inst_1 : Zero γ]
  {μ : MeasureTheory.Measure α} {f : MeasureTheory.SimpleFunc α β} {g : MeasureTheory.SimpleFunc α γ},
  f.FinMeasSupp μ → g.FinMeasSupp μ → (f.pair g).FinMeasSupp μ