| m0 * n + n0 + 1 = m * n + n1, n1 < n, n0 < n, n1 < n0, n1 + 1 < n ⊦ n = 0, n0 = 0, n1 = 0 |
⊦ n0 < n ∧ n1 < n → (m * n + n0 = m0 * n + n1 ↔ m = m0 ∧ n0 = n1)
n0 + 1 < n ∧ n1 < n → (m0 * n + n0 + 1 = m * n + n1 ↔ m0 = m ∧ n0 + 1 = n1), m0 * n + n0 + 1 = m * n + n1, n1 < n, n0 < n, n1 < n0, n1 + 1 < n ⊦ n = 0, n0 = 0, n1 = 0
Used terms: n0 + 1, n, n1, m0, m