151 reputation
4
bio website twitter.com/nodakai
location Singapore
age 29
visits member for 2 years, 6 months
seen Apr 22 '13 at 0:48

Hi. I'm a Japanese computer programmer living in Singapore.

Currently I'm working for a financial firm to write some low-layer programs on Linux using C/C++.

Back in school days, I studied some experimental physics http://arxiv.org/abs/0812.4335 and a bit of mathematics.

Call me Kai --- It's my given name.


Feb
26
awarded  Supporter
Feb
25
comment What is $f(2)$ if $f'(x) = \sin\left(\frac{\pi}{2}e^x\right)$ and $f(0) = 1$?
@GEdgar: Oops, "*" disappeared somewhere while I copy&pasted the URL... This is a corrected version
Feb
25
comment Do I use Euler -method with Differentials correctly?
You need to explain what is "the same book as earlier", what you meant by h, $y_0$ and $y_1$, where k has gone, how you came up with "recursion" (instead of iteration), ... lots of things
Feb
25
comment What is $f(2)$ if $f'(x) = \sin\left(\frac{\pi}{2}e^x\right)$ and $f(0) = 1$?
Hi @GEdgar, you're a professional mathematician, right? Unfortunately your argument seems a bit too succint for me... Could you elaborate on that please? Eg. "total length < 1" is not clear to me at all... I believe it's something like "since $(e^x)'$ is strictly positive, ..." Moreover I don't see why 0.157 is too close to zero. BTW, here is f'(x) plotted by Google
Feb
25
answered Proof of $\displaystyle\sum_{0 \le k \le a} {a \choose k} {b \choose k} = {a+b \choose a}$
Feb
23
awarded  Teacher
Feb
23
revised Finding domain of $\sqrt{ \frac{(x^2-1)(x^2-3)(x^2-5)}{(x^2-2)(x^2-4)(x^2-6)} }$
added 115 characters in body
Feb
23
awarded  Editor
Feb
23
revised Finding domain of $\sqrt{ \frac{(x^2-1)(x^2-3)(x^2-5)}{(x^2-2)(x^2-4)(x^2-6)} }$
added 137 characters in body
Feb
23
answered Finding domain of $\sqrt{ \frac{(x^2-1)(x^2-3)(x^2-5)}{(x^2-2)(x^2-4)(x^2-6)} }$
Feb
20
comment Regular Expressions - Over the alphabet $(a, b, c)$
Just a quick note: are you aware of cstheory.stackexchange.com dedicated to CS?
Feb
5
awarded  Autobiographer