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Proof step 5 from proof product-del1-01 (previous step)

Π(ints -1l i) * i = Π ints, i ∈ ints ⊦ i = 0, Π(ints -1l i) = Π ints / i

User applied rule insert equation

And obtained the following new goals

Proof step 6:
i ∈ ints ⊦ i = 0, Π(ints -1l i) = (Π(ints -1l i) * i) / i

Rule argument

pos: left 1 flags: rotate, discard

Additional information