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Proof step 13 from proof blastN-firstN (previous step)

n ≤ # x0, ∀ n. n ≤ # x0 → butlastn(n, x0) = firstn(# x0 - n, x0) ⊦ 1 + # x0 = n, butlastn(n, x0) = firstn(# x0 - n, x0)

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: n

Additional information

Used terms: n