{α : Type u_1} →
  {β : Type u_2} →
    {γ : Type u_3} →
      {mα : MeasurableSpace α} →
        {mβ : MeasurableSpace β} →
          {mγ : MeasurableSpace γ} →
            ProbabilityTheory.Kernel α β → ProbabilityTheory.Kernel (α × β) γ → ProbabilityTheory.Kernel α (β × γ)