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Proof step 9 from proof byte-law-and-one (previous step)

⊦ band(i, j) = band(bits2int(lastn(8, fillsgn(8, int2bits(i)))), j), b2i(i2b(band(i, j))) = b2i(i2b(band(bits2int(lastn(8, fillsgn(8, int2bits(i)))), j)))

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ band(i, j) = bits2int(bitsand(int2bits(i), int2bits(j))) subst: [j, i] → [j, bits2int(lastn(8, fillsgn(8, int2bits(i))))] rotate: F spec: intops inst: name: band-def

Additional information

Used terms: j, bits2int(lastn(8, fillsgn(8, int2bits(i))))