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Proof step 2 from proof lastn-rec (previous step)

⊦ lastn(n, x) = lastn(n -1, x.butlast) + x.last, n = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ lastn(n, x) = lastn(n - 1, x.butlast) + x.last ', n = 0

Rule argument

Additional information

Used simplifier rules: ⊦ x + a = x + a '; (s)% ⊦ n -1 = n - 1; (s)