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Proof step 1 from proof ls-zero (conclusion)

⊦ i < 0 → (¬ i +1 < 0 ↔ i +1 = 0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
i < 0 ⊦ ¬ i +1 < 0 ↔ i +1 = 0

Rule argument

Additional information