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Proof step 1 from proof blastN-rec (conclusion)

⊦ n ≠ 0 → butlastn(n, x + a ') = butlastn(n -1, x)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ n = 0, butlastn(n, x + a ') = butlastn(n - 1, x)

Rule argument

Additional information

Used simplifier rules: pred-03: ⊦ n -1 = n - 1; from specification nat