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Proof step 15 from proof pos-at (previous step)

m < # str0, ∀ n. n < # str0 → pos(s→l(str0)[n], str0) = n ⊦ char ' + str0 = "", str0 = "", s→l(str0)[m] = char, pos(s→l(str0)[m], str0) = m, char ∈ s→l(str0), dups(s→l(str0))

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: m

Additional information

Used terms: m