| ∃ i, j. rj = rational(i, j) ∧ 0 < j, 0 < j ⊦ rational(i, j) * (rj + rj0) = rational(i, j) * rj + rational(i, j) * rj0 |
0 < j, 0 < j0 ⊦ rational(i, j) * (rational(i0, j0) + rj0) = rational(i, j) * rational(i0, j0) + rational(i, j) * rj0
Used simplifier rules: ⊦ i < j ∧ 0 ≤ i → 0 < j; (forward)