| ¬ band(bcompl(b2i(by1)), bcompl(b2i(by2))) ∈byte ⊦ bcompl(band(bcompl(b2i(by1)), bcompl(b2i(by2)))) = b2i(i2b(bcompl(band(bcompl(b2i(by1)), bcompl(b2i(by2)))))) |
⊦ bcompl(band(bcompl(b2i(by1)), bcompl(b2i(by2)))) = b2i(i2b(bcompl(band(bcompl(b2i(by1)), bcompl(b2i(by2)))))), band(bcompl(b2i(by1)), bcompl(b2i(by2))) ∈byte