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Proof step 4 from proof int2bits-bits2unit (previous step)

i < 0, i < 0 ⊦ sgn(false ' + int2bits(i)) = false ' + int2bits(i)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ bits ≠ [] ∧ (bits.first ↔ ¬ boolvar) → sgn(boolvar ' + bits) = boolvar ' + bits subst: [bits, boolvar] → [int2bits(i), false] rotate: F spec: bitopsaux inst: name: sgn-base-03

Additional information

Used simplifier rules: int2bits-not-empty: ⊦ int2bits(j) ≠ [];%int2bits-first-01: ⊦ j < 0 → int2bits(j).first; Used terms: int2bits(i), false