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Proof step 15 from proof unchanged-rec-generic (previous step)

⊦ unchanged(str, r, st, st1) ∧ 0 ≤ i ∧ i < st[r -- _length] .intval ∧ is_array(str, r, st) ∧ is_referencevalue(st[r -- i ']) ∧ r ≠ jvmref ∧ ( st[r -- i '] .refval ≠ jvmref → st[st[r -- i '] .refval -- _type] .type ≤ st[r -- _type] .type .type ∧ is_valid_ref(str, st[r -- i '] .refval, st)) → unchanged(str, st[r -- i '] .refval, st, st1)

Lemma unchanged-array-forward