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bio website derek1906.site50.net
location United States, Hong Kong
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jQuery is taking over the world! http://i.stack.imgur.com/sGhaO.gif

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Hi there! I am the 283863 th user in stackoverflow.

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Dec
26
comment Why not both true and false?
For the first example we know it's true because we tested every single possible input (for all) through induction.
Dec
22
accepted Dimensions definition?
Dec
20
comment Why do we need to learn Set Theory?
This might as well be the actual article :)
Dec
20
comment Dimensions definition?
@AsafKaragila - It's related, but I believe my question is more about the definition of dimension.
Dec
20
asked Dimensions definition?
Dec
15
awarded  Caucus
Dec
13
comment Trisecting an angle
Nice, thanks.­­­­­
Dec
13
comment Trisecting an angle
@peterwhy - Oh by work I mean a good enough approximation... like how $y=x$ is a "good enough" approximation of $y=\sin{x}$ if $x$ is small.
Dec
13
comment Trisecting an angle
Thanks for this proof using contradiction! By the way, what program did you use to create this nice illustration?
Dec
13
accepted Trisecting an angle
Dec
13
comment Trisecting an angle
I see what you mean now. Since the distance from the middle point to the middle segment is way closer than the other two, the angle in between would be much greater than the other two, so this method only works for small angles. Thanks.
Dec
13
revised Trisecting an angle
added 66 characters in body
Dec
13
comment Trisecting an angle
They are almost "parallel", but they aren't. With great precision trisecting the angle is still possible with this method.
Dec
13
asked Trisecting an angle
Dec
4
comment Parametrizing intersection
@AmitaiYuval - Hm, thanks anyway.
Dec
4
comment Parametrizing intersection
@AmitaiYuval - It's graded by an online computer grader on those homework sites and it says that is not the correct answer.
Dec
4
revised Parametrizing intersection
added 85 characters in body
Dec
4
asked Parametrizing intersection
Nov
14
comment How to find the area inside $x^2+y^2+\sin(4x)+\sin(4y)=4$ using Green's Theorem
There's a thing called "change of coordinates" (in a single integral, this is called "u-substitution"), which by changing the coordinates system (surprise surprise), you can transform the shape to another shape that would be easier to parameterize and integrate. (Though I don't think it works in this case. You can try to change it into something similar to polar coordinates.)
Nov
14
comment How to find the area inside $x^2+y^2+\sin(4x)+\sin(4y)=4$ using Green's Theorem
(The hard part is parameterizing the curve.)