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Proof step 1 from proof modeven-neg-01 (conclusion)

⊦ i < 0 → ((i + 1) % 2 = 0 ↔ ¬((i + 1) % 2 = ~1 ∧ i % 2 = 0))

System applied rule normalize

And obtained the following new goals

Proof step 2:
i < 0 ⊦ (i + 1) % 2 = 0 ↔ ¬((i + 1) % 2 = ~1 ∧ i % 2 = 0)

Rule argument

Additional information