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Proof step 6 from proof bitsand-cast-04 (previous step)

¬ n ≤ # bits, # bits1 < n ⊦ sgn(bitsand(lastn(n, fillsgn(n, bits)), false ' + bits1)) = sgn(bitsand(bits, false ' + bits1)), bits = []

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
# bits1 < n, # bits < n ⊦ sgn(bitsand(lastn(n, fillsgn(n, bits)), false ' + bits1)) = sgn(bitsand(bits, false ' + bits1)), bits = []

Rule argument

Additional information

Used simplifier rules: ⊦ ¬ m ≤ n ↔ n < m;