m0 * n = m0 * m + n0, m0 * n ≤ m0 * m + n0, n0 < m0, m < n ⊦
m0 * n ≤ m0 * m + n0, n0 < m0, m < n ⊦ m0 * n = m0 * m + n0
Used formulas: m0 * n = m0 * m + n0