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Proof step 9 from proof valid-eraseq-stronger-one (previous step)

⊦ valid-eraseq-stronger(apebs, eqent ' + q) ↔ eqent.pnum < # apebs ∧ ¬ eqent.pnum ∈ q ∧ (∀ v, m. (valid-peb(v, m, apebs[eqent.pnum]) ↔ eqent.lebref = v × m) ∧ (eqent.lebref = v × m → apebs[eqent.pnum].vidhdr.sqn ≠ valid-sqns(v, m, apebs).max)) ∧ valid-eraseq-stronger(apebs, q)

Lemma valid-eraseq-stronger-rec