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Proof step 1 from proof getarray-union-02 (
previous step
)
⊦ r -- _length ∈ st ∧ 0 ≤ i ∧ j ≤ st[r -- _length] .intval - i ∧ (∀ i1. i ≤ i1 ∧ i1 < i + j → r -- i1 ' ∈ st) → getarray(r, i, j, st0 ∪ st) = getarray(r, i, j, st)
Lemma
getarray-union-03