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Proof step 1 from proof idexcept-size (conclusion)

⊦ id○(ar0, ar1, n) → # ar0 = # ar1

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: Idexcept: ⊦ id○(ar0, ar1, n) ↔ ¬ ¬(# ar0 = # ar1 ∧ (∀ m. m < # ar0 ∧ m ≠ n → ar0[m] = ar1[m]));