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Proof step 15 from proof inv-write-echdr (previous step)

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

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 1 terms: empty

Additional information

Used simplifier rules: ⊦ ¬ empty.valid?; (s) Used terms: empty