| m0 * m0 + m0 < m * m + m ↔ m0 < m, m0 < m ⊦ 3 * m0 + m0 * m0 < 3 * m + m * m |
m0 * m0 + m0 < m * m + m, m0 < m, 3 * m + m * m ≤ 3 * m0 + m0 * m0 ⊦
Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic% ⊦ m < n ↔ ¬ n ≤ m; (ss)