# Barranka

reputation
8
bio
location       Mexico
age            32
member for     11 months
seen           May 13 at 20:45
profile views  17

Actuary, finance and risk oriented, musician, programmer...

I enjoy mathematics, probability, statistics, numerical methods... and whatever challenges the creativity of human mind.

Just for information, I've found an article that I think it's important before asking something here (or anywhere else): http://mattgemmell.com/2008/12/08/what-have-you-tried/

|          |                | bio     | visits                      |                 |           |
|----------|----------------|---------|-----------------------------|-----------------|-----------|
|          | 157 reputation | website | twitter.com/Pitecantropus80 | member for      | 11 months |
| 8 badges | location       | Mexico  | seen                        | May 13 at 20:45 |           |

# 11 Comments

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| Apr10 | comment | How can I prove that $xy\leq x^2+y^2$?Quite an elegant hint!                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Oct3  | comment | How do you find the center of a circle with a pencil and a book?This solution is far better than the accepted one, since it does not depends on perception ("put the corner of the book..." how do you know that you are really drawing a diameter?). +1 for this answer!                                                                                                                                                                                                                |
| Sep21 | comment | What is $dx$ in integration?Plain links don't help... please improve this answer                                                                                                                                                                                                                                                                                                                                                                                                         |
| Sep21 | comment | What is $dx$ in integration?Quite a good explanation                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Sep20 | comment | What are imaginary numbers?@CliveN. Man! This is one of the greatest, clearest, coolest and simplest answers I've ever seen for this question (and funniest, I had a lot of fun reading it). I will quote it every time I get the chance! +1 (If I could vote more than one time, I would)                                                                                                                                                                                               |
| Aug21 | comment | Which symbol should be used for an empty set?This is not a constructive question... It's just about "what symbol is better"... it's a matter of preference!                                                                                                                                                                                                                                                                                                                              |
| Jun20 | comment | Is it wrong to say $\sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$?Notice that $\sqrt{x^2}=|x|$, so it can be said that $\sqrt{x^2}=\pm x$                                                                                                                                                                                                                                                                                                                                   |
| Jun17 | comment | Is it wrong to say $\sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$?@Théophile ook... $x\geq0$                                                                                                                                                                                                                                                                                                                                                                                |
| Jun7  | comment | What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour?@MarkAdler Thank you Mark... I will soon correct my answer to include this calculation for the value of $\lambda$. And yes, Math is beautiful! :-)                                                                                                                                                                                                                             |
| Jun5  | comment | What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour?That said, I'm correcting my answer, because I calculated the probability of "being spotted" once per interval, which is not what we are looking for. The probability we're looking for is "what is the probability of 'being spotted' at least one time", which is 1 - Pr{"Not 'being spotted'"}.                                                                             |
| Jun5  | comment | What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour?With no further information, the expected value of the tickets per hour is 0.8 (is a Bernoulli experiment). I think the Poisson Process hypothesis holds because all you know is that you may "get caught" with a given probability in a unit of time. Of course you can't be caught more than once a day, but that doesn't implies that you can't be "spotted" n times a day. |
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