riotburn
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 Dec 19 comment Expectation of Stopping Time w.r.t a Brownian Motion I'm looking how to solve $E(\tau )$ in general. The stopping time defined in the original question is a practice question for my final. Dec 19 comment Expectation of Stopping Time w.r.t a Brownian Motion Using M as any martingale such that the optional stopping theorem states: Let $\tau$ be a stopping time and $M_n$ be a martingale. If there is $K\in \mathbb(N)$ such that $\tau \le K$ almost surely then $E(M_{\tau})=E(M_0)$. Dec 19 awarded Custodian Dec 19 reviewed Approve Expectation of Stopping Time w.r.t a Brownian Motion Dec 19 asked Expectation of Stopping Time w.r.t a Brownian Motion Jul 28 awarded Tumbleweed Feb 9 comment how to predict next set of number from two number groups. @Henry: because I can't read :) Feb 8 comment how to predict next set of number from two number groups. Sounds like it would be a 5/59 chance of getting a number in set 2 that is the same as one of the numbers in set 1 Nov 22 awarded Supporter Nov 21 answered What is the limiting ratio in differential equations? Nov 19 comment What is the limiting ratio in differential equations? Yes, but I'm just confirming that that is what I am supposed to do...take the solutions, divide and take the limit. Nov 19 comment What is the limiting ratio in differential equations? No I know how to solve the system, just dont know what the limiting ratio is and how to solve it. Am i just dividing the solutions i get for y(t) and x(t) and then taking the limit? Nov 19 awarded Commentator Nov 19 comment What is the limiting ratio in differential equations? Oh, so what is y(t)/x(t) then? Nov 19 comment What is the limiting ratio in differential equations? no but i have no clue at all what the limiting ratio means. Nov 19 asked What is the limiting ratio in differential equations? Nov 9 revised What is the spherical means method which is used in solving a wave equation of second order? fixed grammar Nov 9 suggested approved edit on What is the spherical means method which is used in solving a wave equation of second order? Nov 3 answered Direction field of $y' = y^2-4$ Oct 10 comment Implications from Characteristic Equation from Second Order Diffeq updated above..