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Proof step 5 from proof bib-neg-low (previous step)

i % 256 < ~128, i < 0, i % 256 < 0, i < ~128 ⊦ b2i(i2b(i)) = i % 256 + 256

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
i < ~128 ⊦ i2b((* i)) = i2b(bits2int(lastn(8, int2bits(i))))
Proof step 7:
i < ~128, i % 256 < ~128, i < 0, i % 256 < 0, i < ~128 ⊦ b2i(i2b(bits2int(lastn(8, int2bits(i))))) = i % 256 + 256

Rule argument

name: num-i2b-neg rotate: F subst: [i] → [i]

Additional information

Used terms: i