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Proof step 14 from proof inv-write-echdr (previous step)

apebs[n] = mkpeb(empty, avhdr, buf, m, false), aehdr.valid?, n < # apebs, ubi-io-inv(apebs), ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ err0 = ESUCCESS, ∃ aehdr. ¬ aehdr.valid?

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 15:
apebs[n] = mkpeb(empty, avhdr, buf, m, false), aehdr.valid?, n < # apebs, ubi-io-inv(apebs), ⌊err0⌋ ⊦ ∃ aehdr. ¬ aehdr.valid?

Rule argument

Additional information

Used simplifier rules: ⊦ ⌊err⌋ → err ≠ ESUCCESS; (s)