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Proof step 9 from proof extensionality (previous step)

# x = # x0, n < # x0, ∀ n. n < # x0 → x[n] = x0[n] ⊦ x[n] = x0[n], x0 = []

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 3 terms: n

Additional information

Used terms: n