| i + i0 * (i2 * j + j0) = (i + i0 * j0) + i0 * i2 * j, j0 < j, 0 ≤ i, 0 ≤ i0, 0 < j, 0 ≤ j0, 0 ≤ i2 ⊦ (i + i0 * (i2 * j + j0)) / j = (i + i0 * j0) / j + i0 * i2 |
j0 < j, 0 ≤ i, 0 ≤ i0, 0 < j, 0 ≤ j0, 0 ≤ i2 ⊦ ((i + i0 * j0) + i0 * i2 * j) / j = (i + i0 * j0) / j + i0 * i2