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Proof step 1 from proof eq-nonzero (conclusion)

⊦ i ≠ 0 → (i * j = i * j0 ↔ j = j0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
i * j = i * j0 ⊦ i = 0, j = j0

Rule argument

Additional information