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Proof step 5 from proof lastn-app (previous step)

true, ∀ y0, n0, x. # y0 < # y → true → lastn(n0 + # y0, x + y0) = lastn(n0, x) + y0 ⊦ lastn(n0 + # y, x + y) = lastn(n0, x) + y

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information