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Proof step 3 from proof mult-comm (previous step)

⊦ rational(ri.num * rj.num, ri.denom * rj.denom) = rj * ri

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ ri * rj = rational(ri.num * rj.num, ri.denom * rj.denom)

Rule argument

name: mult-def rotate: F subst: [rj, ri] → [ri, rj]

Additional information

Used simplifier rules: ⊦ i * j = j * i; Used terms: ri, rj