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Proof step 9 from proof totality (previous step)

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

User applied rule insert equation

And obtained the following new goals

Proof step 10:
i * j0 = i0 * j, 0 < j0, 0 < j ⊦ rational(i * j0, j * j0) = rational(i0, j0)

Rule argument

pos: left 1 flags: discard

Additional information