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Proof step 54 from proof nextl-lemma-butlast-nonempty (previous step)

lf(m0 + 1) = [], lf(0) = a ', [] = nextl(m0, lf(m0).last), m0 < n0, ∀ n, a. nextl(n, a) ≠ [] ⊦ m0 = n0, lf(m0) = [], n0 = 0

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 5 terms: m0, lf(m0).last

Additional information

Used terms: m0, lf(m0).last