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Proof step 1 from proof extension (conclusion)

⊦ x = y ↔ # x = # y ∧ (∀ n. n < # x → x[n] = y[n])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
# x = # y, ∀ n. n < # y → x[n] = y[n] ⊦ x = y

Rule argument

Additional information