Verify that the random times (sigma_{k}) and (tau_{k}) defined in the proof of Lemma 24.1 are stopping
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Verify that the random times \(\sigma_{k}\) and \(\tau_{k}\) defined in the proof of Lemma 24.1 are stopping times.
Data from lemma 24.1
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Lemma 24.1 (Doob's upcrossing estimate) Let (un)neN be a submartingale and denote by U([a, b]; N; x) the number of upcrossings of (un(x))neNo across [a, b] which occur for the indices 0 b} ^N; as usual we set inf=+o. Writing U=U([a, b]; N), we find that To=0 <01 <7 <0
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it is clear that We have to 0 which is clearly a stopping time and since infj 0 u u a n nu ...View the full answer
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