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Proof step 11 from proof get-butlast (previous step)

m < # x0, ∀ n0, a1. n0 < # x0 → (x0 + a1 ')[n0] = x0[n0] ⊦ (x0 + a ')[m] = x0[m], x0 = []

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: m, a

Additional information

Used terms: m, a