⊦ Rton(n)(s, s0) ↔ (∀ m. m ≤ n → Ry(m)(s, s0))
∀ m. m ≤ n0 → Ry(m)(s, s0), m ≤ n0, ∀ m. m ≤ n0 → Po(m)(s) ⊦ Po(m)(s0)
Used terms: s0, s, n0