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Proof step 9 from proof byte-is-cast-01 (previous step)

⊦ bits2int(lastn(8, fillsgn(8, int2bits(i)))) = bits2int(lastn(8, fillsgn(8, int2bits(bits2int(lastn(i→n(8), fillsgn(i→n(8), int2bits(i))))))))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: bits ≠ [] ⊦ int2bits(bits2int(bits)) = sgn(bits);% ⊦ lastn(n, bits) = [] ↔ n = 0;