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Jul 27, 2012 at 13:30 comment added kenneth @George, oops, you are right.
Jul 27, 2012 at 12:15 comment added George Lowther The process will never hit zero at positive times, by comparing to geometric Brownian motion. So $\tau_n=\infty$ for all $n > 0$.
Jul 27, 2012 at 6:30 history asked kenneth CC BY-SA 3.0