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Proof step 4 from proof sgn-mklist (previous step)

m = 0, ∀ boolvar, bits. sgn(mklist(boolvar, m) + sgn(boolvar ' + bits)) = sgn(boolvar ' + bits) ⊦ sgn((boolvar ' + mklist(boolvar, m)) + sgn(boolvar ' + bits)) = sgn(boolvar ' + bits)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ sgn(boolvar ' + sgn(boolvar ' + bits)) = sgn(boolvar ' + bits)

Rule argument

Additional information

Used simplifier rules: sgn-sgn: ⊦ sgn(sgn(bits)) = sgn(bits);% ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1;% ⊦ [] + bits = bits;% ⊦ mklist(boolvar, 0) = [];