1) Let http://dientuvietnam...mimetex.cgi?B_t be a Brownian motion.
Prove that http://dientuvietnam...cgi?B_t^3-3tB_t is a martingale.
2)Let http://dientuvietnam...mimetex.cgi?B_t be a 2_dimenson Brownian motion starting from .
Prove that is a martingale
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