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Proof step 3 from proof extension-01 (
previous step
)
⊦ getbytearray(r, i, j, st) = getbytearray(r0, i0, j0, st0) ↔ j ≤ 0 ∧ j0 ≤ 0 ∨ 0 ≤ j ∧ j = j0 ∧ (∀ j1. 0 ≤ j1 ∧ j1 < j → st[r -- (i + j1) '] .byteval = st0[r0 -- (i0 + j1) '] .byteval)
Lemma
extension