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May
10
comment Online tool for diagonalizing matrices?
@Guesswhoitis. Of course, WolframAlpha pretty much can do everything, and it's free so it's awesome.
May
9
comment Prove that the integers $x$, $x+6$, $x+12$, $x+18$, $x+24$ can only be prime if $x$ is $5$.
@anonymous mod means modulus here.
Apr
20
awarded  Popular Question
Mar
16
awarded  Announcer
Feb
12
awarded  Critic
Feb
12
comment Is there a size of rectangle that retains its ratio when it's folded in half?
This is exactly why the whole world use A series paper (except US, of course).
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