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Proof step 3 from proof dist (previous step)

∀ i, nf. i * Σ(n0, nf) = Σ(n0, λ k. i * nf(k)) ⊦ Σ(n0, nf) * i = Σ(n0, λ k. i * nf(k))

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: i, nf

Additional information

Used simplifier rules: commutativity: ⊦ i * j = j * i; from specification int-mult Used terms: i, nf