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Proof step 18 from proof valid-indices-nonrec (previous step)

n ∈ nx0, # ar ≤ n, ∀ n. n = m ∨ n ∈ nx0 → n < # ar ⊦ nx0 < # ar

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 3 terms: n

Additional information

Used simplifier rules: ⊦ m ≤ n → (n < m ↔ false); (s) Used terms: n