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Proof step 14 from proof bib-neg-low (previous step)

j < 0, ~256 < j, j < ~128 ⊦ b2i(i2b(bits2int(lastn(8, int2bits(j))))) = 256 + j

User applied rule cut formula

And obtained the following new goals

Proof step 15:
# int2bits(j) = 9, j < 0, ~256 < j, j < ~128 ⊦ b2i(i2b(bits2int(lastn(8, int2bits(j))))) = 256 + j
Proof step 28:
j < 0, ~256 < j, j < ~128 ⊦ # int2bits(j) = 9, b2i(i2b(bits2int(lastn(8, int2bits(j))))) = 256 + j

Rule argument

fma: # int2bits(j) = 9

Additional information

Used formulas: # int2bits(j) = 9