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  • 0 posts edited
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  • 16 votes cast
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
Feb
1
asked How to calculate the summation of this sequence
Jan
28
revised How to calculate that series
added 224 characters in body