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Proof step 1 from proof div-minus255-256 (conclusion)

⊦ i % 256 ≠ 0 ∧ i < 0 → (i - 255) / 256 = i / 256 - 1

System applied rule normalize

And obtained the following new goals

Proof step 2:
i < 0 ⊦ i % 256 = 0, (i - 255) / 256 = i / 256 - 1

Rule argument

Additional information