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Proof step 1 from proof sgn-notsame (conclusion)

⊦ sgn(bits) ≠ boolvar ' + boolvar '

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
sgn(bits) = boolvar ' + boolvar ', boolvar ∈ sgn(bits) ⊦

Rule argument

Additional information

Used simplifier rules: ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1;% ⊦ bits + boolvar ' = bits0 → boolvar ∈ bits0; (forward)