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Proof step 911 from proof bitsand-cast (previous step)

mklist(true, # bits1) = bits1, # bits = # bits1 ⊦ bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits2 + bits1, bits3 + bits))), bits3 + bits = [], bits2 + bits1 = [], bits1 = [], bits2 ≠ [] ∧ bits3 ≠ []

User applied rule cut formula

And obtained the following new goals

Proof step 912:
bits2 = [], mklist(true, # bits1) = bits1, # bits = # bits1 ⊦ bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits2 + bits1, bits3 + bits))), bits3 + bits = [], bits2 + bits1 = [], bits1 = [], bits2 ≠ [] ∧ bits3 ≠ []
Proof step 931:
mklist(true, # bits1) = bits1, # bits = # bits1 ⊦ bits2 = [], bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits2 + bits1, bits3 + bits))), bits3 + bits = [], bits2 + bits1 = [], bits1 = [], bits2 ≠ [] ∧ bits3 ≠ []

Rule argument

fma: bits2 = []

Additional information

Used formulas: bits2 = []