∀ {α : Type u_1} {β : Type u_2} {mα : MeasurableSpace α} {mβ : MeasurableSpace β} {κ : ProbabilityTheory.Kernel α β}
  [ProbabilityTheory.IsSFiniteKernel κ] {f : β → α → ENNReal},
  Measurable (Function.uncurry f) → ∀ {s : Set β}, MeasurableSet s → Measurable fun b => ∫⁻ (a : β) in s, f a b ∂κ b