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Proof step 2 from proof sgn-sgn (previous step)

sgn(sgn(bits0)) = sgn(bits0) ⊦ sgn(sgn(boolvar + bits0)) = sgn(boolvar + bits0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: ⊦ boolvar + bits = boolvar ' + bits;