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Proof step 8 from proof restn-empty (previous step)

restn(m, x0) = [], m < # x0, ∀ n0. n0 < # x0 → restn(n0, x0) = [] → n0 = # x0 ⊦ m = # x0, x0 = []

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 3 terms: m

Additional information

Used terms: m