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Oct
10
comment Why can I exchange the order of integration in a multiple Ito stochastic integral?
$(s+ds)^2 - s^2 = 2s ds + ds^2 = 2s ds$
Oct
10
asked Why can I exchange the order of integration in a multiple Ito stochastic integral?
Oct
10
awarded  Informed
Sep
19
comment Demystify integration of $\int \frac{1}{x} \mathrm dx$
I wrote this blog post about it a while ago. arcsecond.wordpress.com/2011/12/17/… My blog says people followed a link from here to there, but I can't find that link on this page, so here it is. It takes a picture-based approach to the problem.
Feb
17
awarded  Popular Question
Feb
14
awarded  Popular Question
Feb
9
awarded  Great Answer
Feb
4
awarded  Good Answer
Feb
2
answered Cannot understand this part from the textbook
Jan
31
awarded  Good Answer
Jan
31
awarded  Mortarboard
Jan
31
comment Find five positive integers whose reciprocals sum to $1$
@gmline This wasn't supposed to be a method for enumerating all the answers or anything like that; just a way to approach it visually that might help for some kids.
Jan
31
awarded  Nice Answer
Jan
31
answered Find five positive integers whose reciprocals sum to $1$
Nov
29
revised What's the expected value of a lottery ticket?
spelling, minor edit
Nov
29
accepted What's the expected value of a lottery ticket?
Nov
29
suggested approved edit on What's the expected value of a lottery ticket?
Nov
29
comment What's the expected value of a lottery ticket?
@cardinal I hadn't thought of it that way, but it's a good point and looks right to me, thanks.
Nov
29
comment What's the expected value of a lottery ticket?
@FlybyNight $n$ is a random variable whose distribution is determined from $p$ and $t$. I believe you do have enough information.
Nov
29
awarded  Critic