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Proof step 8 from proof bytes2int-len-one-01 (previous step)

bytes2int(bytes0) * 256 + band(b2i(by), 255) < 128, 0 ≤ bytes2int(bytes0) * 256 + band(b2i(by), 255) ⊦ bytes0.first = i2b(0), bytes0 = []

User applied rule cut formula

And obtained the following new goals

Proof step 9:
0 ≤ band(b2i(by), 255), bytes2int(bytes0) * 256 + band(b2i(by), 255) < 128, 0 ≤ bytes2int(bytes0) * 256 + band(b2i(by), 255) ⊦ bytes0.first = i2b(0), bytes0 = []

Rule argument

fma: 0 ≤ band(b2i(by), 255)

Additional information

Used simplifier rules: ⊦ ¬ i ≤ j ↔ j < i;% ⊦ 0 ≤ i → ¬ band(i, j) < 0;% ⊦ band(i, band(i0, j)) = band(band(i, i0), j);% ⊦ band(i, j) = band(j, i); Used formulas: 0 ≤ band(b2i(by), 255)