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

boolvar ↔ ¬ boolvar0 ⊦ sgn(boolvar ' + bits + boolvar0 ') = sgn(boolvar ' + bits) + boolvar0 '

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ sgn((¬ boolvar0)' + bits + boolvar0 ') = sgn((¬ boolvar0)' + bits) + boolvar0 '

Rule argument

Additional information