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Proof step 6 from proof le-neg (previous step)

j < i0, i < 0, i * j ≤ i * i0 ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
j < i0, i < 0, i * j ≤ i * i0 ⊦

Rule argument

Additional information

Used simplifier rules: forward-le-02: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward) from specification int-abs