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