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Proof step 4 from proof shiftzero-not-neg (previous step)

¬ 0 ≤ i, >>>(n, i, j) < 0, 0 ≤ i ∨ j ≠ 0 ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
>>>(n, i, j) < 0, i < 0 ⊦ j = 0

Rule argument

Additional information

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