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Proof step 12 from proof bitsand-cast-05 (previous step)

# bits ≤ # bits1 ∧ bits ≠ [], # bits < # bits1 ⊦ bits1 = [], sgn(bitsand(lastn(# bits1, mklist(bits.first, # bits1 - # bits) + bits), false ' + bits1)) = sgn(bitsand(bits, false ' + bits1)), bits = []

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 13:
# bits < # bits1 ⊦ bits1 = [], sgn(bitsand(lastn(# bits1, mklist(bits.first, # bits1 - # bits) + bits), false ' + bits1)) = sgn(bitsand(bits, false ' + bits1)), bits = []

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → m ≤ n;