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Proof step 59 from proof bitsand-cast-05 (previous step)

1 + # bits0 = # bits1 ⊦ sgn(bitsand(false ' + bits0, bits1)) = sgn(false ' + bitsand(false ' + bits0, bits1)), bits1 = []

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: bits ≠ [], bits.first ↔ boolvar ⊦ sgn(boolvar ' + bits) = sgn(bits) subst: [bits, boolvar] → [bitsand(false ' + bits0, bits1), false] rotate: F spec: bitopsaux inst: name: sgn-rec-01

Additional information

Used terms: bitsand(false ' + bits0, bits1), false