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Proof step 5 from proof ext-rec (previous step)

# ar0 = # ar1 ∧ (∀ m. m < # ar0 → ar1[m] = (n = m ⊃ a;ar0[m])) ⊦ ar1 = ar0[n, a]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information