| ki = key-index(key, m1), m0 + 1 < # kar, m0 + 1 < n, kar[m0 + 1].key < kar[0, ki][m0 / 2].key, n ≤ # kar, ∀ m. m < n ∧ m ≠ 0 → ¬ kar[m].key < kar[(m - 1) / 2].key ⊦ kar[0].key < key |
kar[m0 + 1].key < kar[0, key-index(key, m1)][m0 / 2].key, m0 + 1 < n, m0 + 1 < # kar, n ≤ # kar, ∀ m. m < n ∧ m ≠ 0 → ¬ kar[m].key < kar[(m - 1) / 2].key ⊦ kar[0].key < key