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Proof step 2 from proof ubi-io-inv-fwd (previous step)

apebs[n] = apeb, n < # apebs, ubi-io-inv(apebs) ⊦ ubi-io-peb-inv(apeb)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic