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Proof step 12 from proof pos-get (previous step)

m < # x0, ∀ n. n < # x0 → pos(x0[n], x0) = n ⊦ x0 = [], x0[m] = a, pos(x0[m], x0) = m, dups(x0), a ∈ x0

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: m

Additional information

Used terms: m