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Proof step 2 from proof modzero-06 (previous step)

i < 0, j < j0, j < 0 ⊦ 0 < i * j + j0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
j < 0, j < j0, i < 0, i * j + j0 ≤ 0 ⊦

Rule argument

Additional information

Used simplifier rules: ⊦ i < j ↔ ¬ j ≤ i; (ss)