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Proof step 1 from proof lastn-rec (conclusion)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ n = 0, lastn(n, x) = lastn(n - 1, x.butlast) + x.last '

Rule argument

Additional information

Used simplifier rules: Last: ⊦ x + a = x + a '; from specification list%pred-03: ⊦ n -1 = n - 1; from specification nat