| ⊦ s2i(i2s(band(b2i(by0), 255) + 256 * b2i(by))) = band(b2i(by0), 255) + 256 * b2i(by), ¬ band(b2i(by0), 255) + 256 * b2i(by) < ~32768 ∧ ¬ 32767 < band(b2i(by0), 255) + 256 * b2i(by) |
⊦ ¬ band(b2i(by0), 255) + 256 * b2i(by) < ~32768, s2i(i2s(band(b2i(by0), 255) + 256 * b2i(by))) = band(b2i(by0), 255) + 256 * b2i(by)
⊦ ¬ 32767 < band(b2i(by0), 255) + 256 * b2i(by), s2i(i2s(band(b2i(by0), 255) + 256 * b2i(by))) = band(b2i(by0), 255) + 256 * b2i(by)