Dylan Zhu
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 Feb 27 answered Stochastic in finance Feb 27 revised Show $L$ is not a stopping time added 44 characters in body Feb 27 comment Show $L$ is not a stopping time Thanks guys, I did miss something I think is not so important, which is $B \in \mathcal B$, and in a book it said L is not a stopping time unless $A$ is freaky. Thats all the information it provided. And I am not so sure what 'freaky' means here. Feb 26 revised Show $L$ is not a stopping time edited body Feb 26 revised Show $L$ is not a stopping time added 2 characters in body Feb 26 comment Show $L$ is not a stopping time @GEdgar Thanks, your interpretation is really good, and I have noticed this problem, I just dont know how to write the proof. Feb 26 asked Show $L$ is not a stopping time Feb 18 comment Stuck on a relatively easy probability problem Let's say 5 questions team D able to answer are question 1 to 5. The exam paper only contains 3 questions, then the problem becomes choose 3 questions from 20 that belongs to question 1 to 5. Feb 10 comment how to compute this expectation value is that derivative should be differentiated under t not x? Feb 10 awarded Critic Feb 10 comment how to compute this expectation value I have very limited experience for gamma function, could you give more detail how to do this trick? Feb 10 revised how to compute this expectation value edited title Feb 10 asked how to compute this expectation value Feb 9 comment Generalized Hölder inequality, the case when equality holds for two functions $f,g$ , $p^{-1} + q^{-1}= 1$,and $f \in \mathcal L^p (\mu), g\in \mathcal L^q (\mu)$. Then the equality holds iff ${|f|^p \over ||f||_p^p}={|g|^q \over ||g||_q^q} a.e.$, hope this is helpful Feb 9 comment How to work out this integral @D.L. yes, thank you, i correct it Feb 9 revised How to work out this integral added 8 characters in body Feb 9 accepted How to work out this integral Feb 9 comment How to work out this integral yes, but I only know when its double integral you can change it to polar coord. Feb 9 asked How to work out this integral Feb 1 accepted How to calculate the summation of this sequence