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Proof step 21 from proof crash-neutral-write-echdr (previous step)

apebs[n] = mkpeb(empty, avhdr, buf, m, false), apebs0 = apebs, aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ubi-io-write-echdr-pre(n, aehdr, apebs)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).echdr = aehdr; (s)% ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).bad ↔ boolvar; (s)%⊦ ubi-io-write-echdr-pre(n, aehdr, apebs) ↔ n < # apebs ∧ ¬ apebs[n].bad ∧ aehdr.valid? ∧ apebs[n].echdr = empty; (s)