Feb
27
reviewed Approve suggested edit on Are coinductive proofs necessary?
Feb
27
comment viscosity solution vs. weak solution
once again, thank you for all your help. :) i will check the conditions + the reference.
Feb
27
reviewed No Action Needed Linear to semi-logarithmic scale
Feb
27
comment Expected value of Stock Price, Poisson Process
I wanted to ask actually: what do you mean by Levy Khintchin representation in this case. If we take the log of $S_t$, it is a Compound Poisson process with jump distribution $X_i$, so we know what $S_t$ is by Levy Khintchin formula (by setting the argument of the Levy Khintchin formula a complex number). Is this what you meant? I do not know what Levy Khitchin representation is. Would be nice if you can elaborate.
Feb
27
comment probability related coining tossing question
Please note, this is not probability THEORY... I have edited your title.
Feb
27
revised probability related coining tossing question
edited title
Feb
27
comment If $X_1, X_2$ have exponential distributions what distribution does $Y = \sqrt{X_1^2 + X_2^2}$ have?
This is horrible, why do you think there might be an analytically result? my gut feeling is there is not.
Feb
27
comment $\mathbb{E}[B^4(t)]$ with $B$= brownian motion
1. Please consider accepting the answer below by pressing tick. 2. here is cheap way way. $B_t$ distributed as $N(0,t)$, so you just want the 4th comment of $N(0,t)$. This can easily found on wikipedia. You might to check this against the answer below.
Feb
27
reviewed Approve suggested edit on Fundamental theorem of calculus
Feb
27
comment Expected value of Stock Price, Poisson Process
Hello, I downvoted your answer. This is not because I think it is a bad answer, but on this site, it is the norm that people do not give answers to questions which shows no attempt. This, imo, can easily be a homework question and the OP showed no attempt at it. This is why I left a comment below the question on something to look at, but I did not post answer myself. I hope you can understand.
Feb
27
reviewed Approve suggested edit on Symmetric group is not cyclic
Feb
27
reviewed Approve suggested edit on Example of a simple ring with a nonsimple subring?
Feb
27
reviewed Reject suggested edit on Adelic/Idelic method for number fields
Feb
27
comment Expected value of Stock Price, Poisson Process
No. This has nothing to do with thinning. You need to take conditional expectation with respect to N(t) to get the mean and conditional variance formula to get the variance.
Feb
26
comment viscosity solution vs. weak solution
Thank you again. I have 1 very last question: how does 'elliptic' and 'parabolic' in the classical linear PDE sense relate to the 'degenerate ellipiticity' condition in viscosity solution? Am I correct to think they are sufficient conditions for 'degenerate ellipitcity'?
Feb
26
awarded  Altruist
Feb
26
awarded  Benefactor
Feb
26
accepted Exact smoothness condition necessary for differentiation under integration sign to hold.
Feb
25
reviewed Leave Open What Information/Advantage do we Gain by Substituting a Continuous Map by a Fibration?
Feb
25
reviewed Leave Open Equation for a graph with just a single point (1,1)