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Proof step 1 from proof inv-isbad (conclusion)

ubi-io-inv(apebs), ubi-io-isbad-pre(n, apebs) ⊦ ⟪aubi_io_isbad#(n, apebs; ; isbad, err)⟫ true

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
n < # apebs, ubi-io-inv(apebs) ⊦ ⟪aubi_io_isbad#(n, apebs; ; isbad, err)⟫ true

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic% ⊦ ubi-io-isbad-pre(n, apebs) ↔ n < # apebs; (s)