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Proof step 962 from proof bitsand-cast (previous step)

⊦ bits1 = [], bits2 + bits1 = [], bits0 = [], lastn(# bits1, bits1) = lastn(# bits1, fillsgn(# bits1, bitsand(bits2 + bits1, bits0))), true ∈ bits1

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 963:
⊦ n = # bits → lastn(n, bits) = bits
Proof step 964:
# bits1 = # bits1 ⊦ bits1 = [], bits2 + bits1 = [], bits0 = [], bits1 = lastn(# bits1, fillsgn(# bits1, bitsand(bits2 + bits1, bits0))), true ∈ bits1

Rule argument

seq: ⊦ n = # bits → lastn(n, bits) = bits subst: [bits, n] → [bits1, # bits1] rotate: F spec: list-del inst: bitlista name: lastN-all

Additional information

Used terms: bits1, # bits1