| i + i1 * j + j0 = i1 * j + i + j0, 0 < i1, 0 < j, 0 < i1 * j + j0, j0 < j, i + j0 < 0, i < 0, 0 ≤ i1, 0 ≤ j0, 0 ≤ i + i1 * j + j0, j ≤ i1 * j + j0 ⊦ (i + i1 * j + j0) % j = (i + j0) % j + j, (i + j0) % j = 0, j = 1 |
i < 0, i + j0 < 0, j0 < j, 0 < i1 * j + j0, 0 < j, 0 < i1, j ≤ i1 * j + j0, 0 ≤ i1 * j + i + j0, 0 ≤ j0, 0 ≤ i1 ⊦ (i + j0) % j = 0, (i1 * j + i + j0) % j = (i + j0) % j + j, j = 1