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Proof step 1 from proof sgn-append-05 (conclusion)

⊦ ¬ false ∈ bits ∧ bits ≠ [] → sgn(bits + bits0) = sgn(true ' + bits0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ bits = [], sgn(bits + bits0) = sgn(true ' + bits0), false ∈ bits

Rule argument

Additional information