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Proof step 53 from proof byte-law-and-one (previous step)

8 = # fillsgn(8, int2bits(i)), # int2bits(j) < 8, # int2bits(i) < 8 ⊦ bitsand(fillsgn(8, int2bits(i)), int2bits(j)) = [], lastn(8, fillsgn(8, bitsand(int2bits(i), int2bits(j)))) = lastn(8, fillsgn(8, bitsand(fillsgn(8, int2bits(i)), int2bits(j))))

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ n = # bits → lastn(n, bits) = bits subst: [bits, n] → [fillsgn(8, bitsand(int2bits(i), int2bits(j))), 8] rotate: F spec: list-del inst: bitlista name: lastN-all

Additional information

Used terms: fillsgn(8, bitsand(int2bits(i), int2bits(j))), 8