n < m, n < n0, max(m, n) < n0, n0 ≤ m ⊦ m = max(max(m, n), n0)
n < m, n < n0, n0 ≤ m ⊦ m = max(max(m, n), n0), max(m, n) < n0
Used formulas: max(m, n) < n0