⊦ max(n, m) = (n < m ⊃ m;n)
(m + 1 < n ⊃ n;m + 1) ≤ n0, ∀ n0. n0 ∈ ns → n0 < n, n0 = m ∨ n0 ∈ ns ⊦
Used terms: n, m + 1