| m < (m + n) / 2, m < n, n < (m + n) / 2, m + 1 < (m + n) / 2 ⊦ n = 0, (m + n) / 2 = 0 |
n ≠ 0 ⊦ m0 = m / n ∧ n0 = m % n ↔ m = m0 * n + n0 ∧ n0 < n
m + n = m0 * 2 + n0 ∧ n0 < 2 ∧ 2 ≠ 0, m < m0, m < n, n < m0, m + 1 < m0 ⊦ n = 0, m0 = 0
Used terms: m + n, 2, m0, n0