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Proof step 4 from proof one (previous step)

¬ 0 < i ⊦ i = 0, rational(i, i) = rational(1, 1)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
i < 0 ⊦ rational(i, i) = rational(1, 1)

Rule argument

Additional information

Used simplifier rules: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward)% ⊦ i < j → ¬ j < i;% ⊦ ¬ i < j → (i ≠ j ↔ j < i);