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arxiv: 1501.04542 · v2 · pith:K22PP4I5new · submitted 2015-01-19 · 🧮 math.PR

Sparre-Andersen identity and the last passage time

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It is shown that the celebrated result of Sparre Andersen for random walks and L\'evy processes has intriguing consequences when the last time of the process in $(-\infty,0]$, say $\sigma$, is added to the picture. In the case of no positive jumps this leads to six random times, all of which have the same distribution - the uniform distribution on $[0,\sigma]$. Surprisingly, this result does not appear in the literature, even though it is based on some classical observations concerning exchangeable increments.

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