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Proof step 27 from proof bitsand-cast-05 (previous step)

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

User applied rule cut formula

And obtained the following new goals

Proof step 28:
# bits1 ≤ # bits ⊦ # bits1 = # bits, bits = [], sgn(bitsand(lastn(# bits1, bits), false ' + bits1)) = sgn(bitsand(bits, false ' + bits1)), bits1 = []

Rule argument

fma: # bits1 = # bits

Additional information

Used simplifier rules: ⊦ n = # bits → lastn(n, bits) = bits; Used formulas: # bits1 = # bits