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

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ butlastn(n, x + a ') = butlastn(n - 1, x), n = 0

Rule argument

Additional information

Used simplifier rules: ⊦ n -1 = n - 1; (s)