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Proof step 57 from proof bib-neg-high (previous step)

~128 < j0, i0 * 256 + j0 < 0, ~128 ≤ j0, i0 * 256 + j0 ≤ ~256, i0 < 0, j0 < 0 ⊦ b2i(i2b(bits2int(lastn(8, int2bits(i0 - 1) + fillsgn(8, int2bits(j0)))))) = j0, ~256 ≠ i0 * 256 + j0 ∧ lastn(8, int2bits(i0 - 1) + fillsgn(8, int2bits(j0))).first

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: list-del inst: bitlista name: lastN-append seq: ⊦ n = # bits → lastn(n, bits0 + bits) = bits subst: [bits, bits0, n] → [fillsgn(8, int2bits(j0)), int2bits(i0 - 1), 8] flags: rewrite

Additional information

Used terms: fillsgn(8, int2bits(j0)), int2bits(i0 - 1), 8