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+--- Thread: How can someone type this capcha? (/showthread.php?tid=39171)
How can someone type this capcha? - Unauthorized Intruder - 2011-03-12
![[Image: 5512051751_bb56fbafcd_z.jpg]](http://farm6.static.flickr.com/5136/5512051751_bb56fbafcd_z.jpg)
Found from Thai Failblog. Seriously, how could anyone type that root.
How can someone type this capcha? - butterfλi - 2011-03-12
I've had those before. It's a math problem to solve. Either solve it or refresh it.
![[Image: gt1jb.png]](http://i.imgur.com/gt1jb.png)
Your answer is A btw
How can someone type this capcha? - DarkQThunder - 2011-03-12
Maybe the capcha wants to stop anybody who doesn't know moderately high level math? (It simplifies to ||A|| if anybody is wondering)
Still quite lol even if that's what they were going for...
EDIT: @ above, ||x|| is the norm of complex number x (unless I'm being stupid) so it should be assumed imo that in this case A^n, and therefor likely A, is complex as well.
How can someone type this capcha? - Unauthorized Intruder - 2011-03-12
So you mean they have to type in the answer?
Well, another level of bot catching. I thought you have to type in the equation.
How can someone type this capcha? - SunnySis - 2011-03-12
all captcha only use one word, the other is a dummy. just type anything random for the dummy and then the real word.
How can someone type this capcha? - sicnarf - 2011-03-12
reCAPTCHA uses one word which is known and another word which is not known (in order to help digitize books). You most likely only need to put in ghtiente correctly to proceed.
How can someone type this capcha? - Dusk - 2011-03-12
DarkQThunder Wrote:EDIT: @ above, ||x|| is the norm of complex number x (unless I'm being stupid) so it should be assumed imo that in this case A^n, and therefor likely A, is complex as well.
What? ||x|| means absolute value of x.
How can someone type this capcha? - Kalovale - 2011-03-12
+-A ghtiente
How can someone type this capcha? - shouri - 2011-03-12
Dusk Wrote:What? ||x|| means absolute value of x.
http://en.wikipedia.org/wiki/Norm_%28mathematics%29#Euclidean_norm
How can someone type this capcha? - Kalovale - 2011-03-12
shouri Wrote:http://en.wikipedia.org/wiki/Norm_%28mathematics%29#Euclidean_norm
Pretty sure capital A is not a vector. Oh wait, can we even have vectors to polynomial powers? Doesn't seem to make sense. My Algebra is pineappleed up.
How can someone type this capcha? - Kunagisa - 2011-03-12
Easy. g ghtiente, Google doesn't even know what the first one is, so you can type anything and it'll think it's right. I dunno if it still works, but you used to be able to also just click the audio verification and type any letter 8 or 9 times consecutively and it'd think it's correct.
How can someone type this capcha? - shouri - 2011-03-12
Assume A is vector/matrix related:
You cant have A ^ n (unless A is an m x m matrix), but this is ||A|| ^ n which is perfectly fine. ||A|| is the magnitude of A (which we assume is a vector), and the magnitude of A is just a number... nothing wrong with raising a number to the power of n.
How can someone type this capcha? - Kalovale - 2011-03-12
shouri Wrote:Assume A is vector/matrix related:
You cant have A ^ n (unless A is an m x m matrix), but this is ||A|| ^ n which is perfectly fine. ||A|| is the magnitude of A (which we assume is a vector), and the magnitude of A is just a number... nothing wrong with raising a number to the power of n.
This is ||A^n||, not ||A||^n. It's only the same thing when you consider A to be a number, no?
How can someone type this capcha? - Justin - 2011-03-12
Captcha thread gone math. What the hell.
How can someone type this capcha? - shouri - 2011-03-12
ho lols, guess I really am too sleepy atm.
||A^n|| is fine if A is a number, and might be fine if A is an m x m matrix. not sure what the magnitude of a matrix is... possibly the determinant? 0.o