=+10.4. The natural generalization of (4.9) is

(10.6)

u (lim inf An) ≤ lim inf u ( A„)

≤ lim sup u( An) ≤ w lim sup An).

Show that the left-hand inequality always holds. Show that the right-hand inequality holds if (U. , , A) < @ for some n but can fail otherwise.