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Proof step 7 from proof div-neg-01 (previous step)

¬ rj.num * ri.denom ≠ 0 ⊦ rj = 0r, rational(rj.denom * ri.num, ~(rj.num * ri.denom)) = ~(ri / rj)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information