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Proof step 5 from proof blastN-rec-01 (previous step)

x ≠ [] → (∃ y, a. x = y + a '), 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)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
n ≤ # x, x ≠ [] → x = y + a0 ', ∀ x0, n, a. # x0 < # x → n ≤ # x0 → butlastn(n, a ' + x0) = a ' + butlastn(n, x0) ⊦ butlastn(n, a ' + x) = a ' + butlastn(n, x)

Proof step 5 from proof blastN-rec-01 (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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