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Proof step 1 from proof modzero-06 (conclusion)

⊦ i < 0 ∧ j < j0 ∧ j < 0 → 0 < i * j + j0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
i < 0, j < j0, j < 0, i * j + j0 ≤ 0 ⊦

Rule argument

Additional information

Used simplifier rules: lels: ⊦ ¬ i < j ↔ j ≤ i; from specification int-abs