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Proof step 1 from proof band-mod256-neg (conclusion)

⊦ 0 ≤ i ∧ 127 < i % 256 → band(255, i % 256 - 256) = i % 256

User applied rule cut formula

And obtained the following new goals

Proof step 2:
255 = 2 ^ 8 - 1 ⊦ 0 ≤ i ∧ 127 < i % 256 → band(255, i % 256 - 256) = i % 256

Rule argument

fma: 255 = 2 ^ 8 - 1

Additional information

Used formulas: 255 = 2 ^ 8 - 1