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Proof step 2 from proof mult-zero (previous step)

⊦ ri * rational(0, 1) = rational(0, 1)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ ri * rj = rational(ri.num * rj.num, ri.denom * rj.denom)
Proof step 4:
⊦ rational(ri.num * rational(0, 1).num, ri.denom * rational(0, 1).denom) = rational(0, 1)

Rule argument

name: mult-def rotate: F subst: [rj, ri] → [rational(0, 1), ri]

Additional information

Used terms: rational(0, 1), ri