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Proof step 776 from proof bitsand-cast (previous step)

# bits1 = 2 + # bits ⊦ bits1 = [], bits4 + bits1 = [], bits4 = [], bits2 = [], bitsand(bits1, false ' + true ' + bits) = lastn(# bits1, bitsand(bits1, false ' + true ' + bits))

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 777:
⊦ n = # bits → lastn(n, bits) = bits
Proof step 778:
# bits1 ≠ # bitsand(bits1, false ' + true ' + bits), # bits1 = 2 + # bits ⊦ bits1 = [], bits4 + bits1 = [], bits4 = [], bits2 = [], bitsand(bits1, false ' + true ' + bits) = lastn(# bits1, bitsand(bits1, false ' + true ' + bits))

Rule argument

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

Additional information

Used simplifier rules: ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1; Used terms: bitsand(bits1, false ' + true ' + bits), # bits1