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Proof step 1 from proof sgn-rec-01 (conclusion)

bits ≠ [], bits.first ↔ boolvar ⊦ sgn(boolvar ' + bits) = sgn(bits)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ sgn(bits.first ' + bits) = sgn(bits), bits = []

Rule argument

Additional information