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Proof step 1 from proof mult-def-03 (conclusion)

⊦ j1 ≠ 0 ∧ j2 ≠ 0 → rational(i1, j1) * rational(i2, j2) = rational(i1 * i2, j1 * j2)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

name: mult-def-02 rotate: F subst: [j2, i2, j1, i1] → [j2, i2, j1, i1]

Additional information

Used simplifier rules: ⊦ i * j = j * i; Used terms: j2, i2, j1, i1