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Proof step 231 from proof byte-law-and-one (previous step)

# bits = 8, int2bits(i) = bits0 + bits, 0 ≤ j, 0 < j, j < 128, 64 ≤ j ⊦ lastn(8, fillsgn(8, bitsand(bits0 + bits, int2bits(j)))) = lastn(8, fillsgn(8, bitsand(bits, int2bits(j)))), bitsand(bits, int2bits(j)) = [], bits0 = []

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ # bits1 ≤ # bits0 ∧ bits1 ≠ [] ∧ ¬ bits1.first → bitsand(bits + bits0, bits1) = bitsand(bits0, bits1) subst: [bits1, bits0, bits] → [int2bits(j), bits, bits0] rotate: F spec: intops inst: name: bitsand-app-false

Additional information

Used terms: int2bits(j), bits, bits0