∀ {α : Type u_1} {β : Type u_2} {mα : MeasurableSpace α} {mβ : MeasurableSpace β} {f : α × β → ℚ → ℝ}
  {κ : ProbabilityTheory.Kernel α (β × ℝ)} {ν : ProbabilityTheory.Kernel α β},
  ProbabilityTheory.IsRatCondKernelCDFAux f κ ν → ∀ (a : α) (q : ℚ), ∀ᵐ (c : β) ∂ν a, 0 ≤ f (a, c) q