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Proof step 4 from proof equality-02 (previous step)

i * j0 = i0 * j, 0 < j, 0 < j0 ⊦ rational(i, j) = rational(i0, j0), ¬ i ≤ 0 ∧ ¬ i0 ≤ 0

User applied rule cut formula

And obtained the following new goals

Proof step 5:
i < 0, i * j0 = i0 * j, 0 < j, 0 < j0 ⊦ rational(i, j) = rational(i0, j0), ¬ i ≤ 0 ∧ ¬ i0 ≤ 0
Proof step 17:
i * j0 = i0 * j, 0 < j, 0 < j0 ⊦ i < 0, rational(i, j) = rational(i0, j0), ¬ i ≤ 0 ∧ ¬ i0 ≤ 0

Rule argument

fma: i < 0

Additional information

Used formulas: i < 0