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Proof step 72 from proof byte-law-righthift-not (previous step)

i2b(bits2uint(sublist(0, 31, fillsgn(32, int2bits(128))))) = i2b(bits2uint(firstn(31, fillsgn(32, int2bits(~128))))), # int2bits(128) ≤ 32, # int2bits(~128) ≤ 32 ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ sublist(m, n, bits) = firstn(n, restn(m, bits)) subst: [bits, n, m] → [fillsgn(32, int2bits(128)), 31, 0] rotate: F spec: list-del inst: bitlista name: sublist-def

Additional information

Used terms: fillsgn(32, int2bits(128)), 31, 0