| cast(i, j1) = cast(i, 2 ^ i + j1), 0 < i, 0 < i, 0 ≤ i, i0 < 2 ^ i + j1, i0 < i, i0 ≤ 0, 0 < 2 ^ i + j1, i0 * 2 ^ i + j1 < 0, j1 < 0, 0 < i ⊦ cast(i, j0 + j1) = cast(i, cast(i, j1) + j0) |
0 < i, 0 < i, 0 ≤ i, i0 < 2 ^ i + j1, i0 < i, i0 ≤ 0, 0 < 2 ^ i + j1, i0 * 2 ^ i + j1 < 0, j1 < 0, 0 < i ⊦ cast(i, j0 + j1) = cast(i, cast(i, 2 ^ i + j1) + j0)