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Proof step 1 from proof mods-ls-01 (conclusion)

⊦ i < i0 ∧ abs(j0) < j → i * j < i0 * j + j0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
i < i0, abs(j0) < j, i0 * j + j0 ≤ i * j ⊦

Rule argument

Additional information

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