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Proof step 6 from proof equality-02 (previous step)

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

User applied rule cut formula

And obtained the following new goals

Proof step 7:
i0 < 0, i * j0 = i0 * j, 0 < j, 0 < j0, i < 0 ⊦ rational(i, j) = rational(i0, j0)
Proof step 14:
i * j0 = i0 * j, 0 < j, 0 < j0, i < 0 ⊦ i0 < 0, rational(i, j) = rational(i0, j0)

Rule argument

fma: i0 < 0

Additional information

Used formulas: i0 < 0