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Proof step 17 from proof crash-neutral-write-vidhdr (previous step)

apebs[n] = mkpeb(aehdr, empty, buf, m, false), aehdr.valid?, avhdr0.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ∃ avhdr. ¬ avhdr.valid? ∧ ⟨apebs1 := apebs[n, apebs[n].vidhdr:= avhdr]⟩ (apebs = apebs1)

User applied rule exists right

And obtained the following new goals

Proof step 18:
apebs[n] = mkpeb(aehdr, empty, buf, m, false), avhdr0.valid?, aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ¬ empty.valid? ∧ ⟨apebs1 := apebs[n, apebs[n].vidhdr:= empty]⟩ (apebs = apebs1)

Rule argument

pos: right 1 terms: empty abort: F discard: T computed: T

Additional information

Used terms: empty