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Proof step 47 from proof nextl-lemma-butlast-nonempty (previous step)

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

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 4 terms: m

Additional information

Used terms: m