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Proof step 53 from proof bitsand-cast-05 (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 54:
# bits = # bits1 ⊦ bits = [], sgn(bitsand(bits1, bits)) = sgn(false ' + bitsand(bits, bits1)), bits1 = [], bits.first

Rule argument

Additional information

Used simplifier rules: ⊦ m ≤ m;