| ~ i + ~1 = i0, ~1 = i0 + i, i0 < i, i0 + 1 < i0 * j + 2 * j, 0 < i0 * j + 2 * j, i0 < 0, 1 + i0 * j < j, i0 < j, 0 < j, i0 + 1 < j, i0 < i0 * j + 2 * j, 0 < i, i0 + 1 < i ⊦ |
~1 = (~ i + ~1) + i, ~ i + ~1 < i, (~ i + ~1) + 1 < (~ i + ~1) * j + 2 * j, 0 < (~ i + ~1) * j + 2 * j, ~ i + ~1 < 0, 1 + (~ i + ~1) * j < j, ~ i + ~1 < j, 0 < j, (~ i + ~1) + 1 < j, ~ i + ~1 < (~ i + ~1) * j + 2 * j, 0 < i, (~ i + ~1) + 1 < i ⊦