| i1 < j2, 0 < j2, j0 < j2, i0 < i, 0 ≤ j0, (i1 + 1) * i ≤ (i1 + 1) * i0 + j0, j0 ≤ i1, 0 ≤ i1 ⊦ j0 < i1 ∧ i1 * i ≤ i1 * i0 + j0 |
⊦ (i + i0) * j = i * j + i0 * j
i0 < i, j0 < j2, 0 < j2, i1 < j2, 0 ≤ i1, j0 ≤ i1, i1 * i + 1 * i ≤ (i1 + 1) * i0 + j0, 0 ≤ j0 ⊦ j0 < i1 ∧ i1 * i ≤ i1 * i0 + j0
Used terms: i, 1, i1