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Proof step 23 from proof div-def-01 (previous step)

i0 * j ≠ 0, rational(i, j) / ~ rational(i0, j0) = ~ rational(i * j0, i0 * j), 0 < j, 0 < j0, 0 < i, i0 < 0 ⊦ rational(i, j) / rational(i0, j0) = rational(i * j0, j * i0), i0 = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: ⊦ i * j = j * i;% ⊦ i * j * j0 = (i * j) * j0;% ⊦ i * j = 0 ↔ i = 0 ∨ j = 0;