| ⊦ ubi-io-initial(apebs) → (ubi-io-initial(apebs[n, apeb]) ↔ n < # apebs ∧ ubi-io-peb-initial(apebs[n]) → ubi-io-peb-initial(apeb)) |
ubi-io-initial(apebs) ⊦ ubi-io-initial(apebs[n, apeb]) ↔ n < # apebs ∧ ubi-io-peb-initial(apebs[n]) → ubi-io-peb-initial(apeb)