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Proof step 15 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

Used simplifier rules: denom-not-zero: ⊦ ri.denom ≠ 0;% ⊦ i * j = j * i;% ⊦ i * j * j0 = (i * j) * j0;% ⊦ i * j = 0 ↔ i = 0 ∨ j = 0;