| i + j = i0 * 2 + j0, i < 0, j < 0, i < i0, j < i0, abs(j0) < 2, i ≤ j, j0 ≤ 0, i0 ≤ 0 ⊦ |
i + j = i0 * 2 + j0, j0 = ~1, abs(j0) < 2, j < i0, i < i0, j < 0, i < 0, i0 ≤ 0, j0 ≤ 0, i ≤ j ⊦
i + j = i0 * 2 + j0, abs(j0) < 2, j < i0, i < i0, j < 0, i < 0, i0 ≤ 0, j0 ≤ 0, i ≤ j ⊦ j0 = ~1
Used formulas: j0 = ~1