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Proof step 1 from proof fix-neg-le (conclusion)

⊦ # bytes ≤ n ∧ bytes2int(bytes) < 0 → fix(n, bytes) = mklist(i2b(~1), n - # bytes) + bytes

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
# bytes ≤ n, bytes2int(bytes) < 0 ⊦ fix(n, bytes) = mklist(i2b(~1), n - # bytes) + bytes

Rule argument

Additional information

Used simplifier rules: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward)