If you have a continuous stochastic process, then how is the hitting time for a closed set different from the hitting time of an open set when we're trying to show it is a stopping time?
Hitting times of closed vs. open sets
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stochastic-processes
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0[See the related discussion here.](http://math.stackexchange.com/questions/111273/hitting-open-sets) Please tell if it is what you wanted - or your question is more specific – 2012-02-22