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Proof step 2 from proof blastN-rec-01 (previous step)

n ≤ # x ⊦ butlastn(n, a ' + x) = a ' + butlastn(n, x)

User applied rule induction

And obtained the following new goals

Proof step 3:
n ≤ # x, ∀ x0, n, a. # x0 < # x → n ≤ # x0 → butlastn(n, a ' + x0) = a ' + butlastn(n, x0) ⊦ butlastn(n, a ' + x) = a ' + butlastn(n, x)

Rule argument

indvar: # x wfpred: <

Additional information

Used simplifier rules: <; (wellfounded) Used terms: # x