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Proof step 1 from proof sgn-base-02 (conclusion)
⊦ sgn(false ' + true ' + bits) = false ' + true ' + bits
User applied rule insert lemma
And obtained the following new goals
Proof step 2
:
⊦ sgn(boolvar ' + (¬ boolvar)' + bits) = boolvar ' + (¬ boolvar)' + bits
Rule argument
name: sgn-base subst: [boolvar, bits] → [false, bits]
Additional information
Used terms: false, bits