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Proof step 921 from proof bitsand-cast (previous step)

# bits = # bits1 ⊦ bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits, mklist(true, # bits1)))), bits3 + bits = [], bits1 = [], mklist(true, # bits1).first

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 922:
⊦ m ≠ 0 → (mklist(boolvar, m).first ↔ boolvar)

Rule argument

seq: ⊦ m ≠ 0 → (mklist(boolvar, m).first ↔ boolvar) subst: [m, boolvar] → [# bits1, true] rotate: F spec: list-last inst: bitlista name: mk-first-01

Additional information

Used simplifier rules: ⊦ # bits = 0 ↔ bits = []; Used terms: # bits1, true