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Proof step 48 from proof bib-on-bits (previous step)

bits2int(lastn(8, int2bits(i))) < ~128, 8 ≤ # int2bits(i), bits2int(lastn(8, int2bits(i))) < 0 ⊦ b2i(i2b(bits2int(lastn(8, int2bits(i))))) = bits2int(lastn(8, int2bits(i))), ¬ i < ~128 ∧ ¬ 127 < i

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ # bits = 8 → ¬ bits2int(bits) < ~128 subst: [bits] → [lastn(8, int2bits(i))] rotate: F spec: int2bits inst: name: bits2int8

Additional information

Used simplifier rules: ⊦ n ≤ # bits → # lastn(n, bits) = n; Used terms: lastn(8, int2bits(i))