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Proof step 9 from proof bitsand-cast-04 (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 10:
# bits1 < n, # bits < n ⊦ sgn(bitsand(lastn(n, mklist(bits.first, n - # bits) + bits), false ' + bits1)) = sgn(bitsand(bits, false ' + bits1)), bits = []

Rule argument

Additional information

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