Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2001/iii/paper-21/4/b/solution

True. The negative-level hitting times from the preceding calculation are almost surely finite for every negative integer, and occur at unbounded times. Therefore
This is the almost-sure negation in the original PDF, not another assertion of convergence. The stronger oscillation statement and rules out that convergence path by path.

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