185 reputation
111
bio website twitter.com/Pitecantropus80
location Mexico
age 34
visits member for 2 years, 6 months
seen 2 days ago

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/


2d
awarded  Constituent
Dec
15
awarded  Caucus
Dec
6
comment Prove by induction that $5^n - 1$ is divisible by $4$.
Nice, clear, clean... a good answer indeed!
Sep
19
comment A function that creates a partition of values such that the sum is 1
Thank you!!! Do you know is this function has some special name (other than geometric series)? (I know I found it in a book some years ago, but I can't remember the name... or the book)
Sep
19
awarded  Scholar
Sep
19
accepted A function that creates a partition of values such that the sum is 1
Sep
19
revised A function that creates a partition of values such that the sum is 1
added 50 characters in body
Sep
19
comment A function that creates a partition of values such that the sum is 1
duh, right! Forgot to write that $k$ is a (deterministic) parameter of the function
Sep
19
comment A function that creates a partition of values such that the sum is 1
$k$ is a real number in the interval $(0,1)$
Sep
19
revised A function that creates a partition of values such that the sum is 1
added 94 characters in body
Sep
19
awarded  Student
Sep
19
comment A function that creates a partition of values such that the sum is 1
@Donkey_2009 No, I mean exactly the natural numbers... I'm editing the question to make it more clear
Sep
19
asked A function that creates a partition of values such that the sum is 1
Sep
17
comment How can one prove that $e<\pi$?
Fast, simple, elegant... Love it!
Aug
27
comment math fallacy problem: $-1= (-1)^3 = (-1)^{6/2} = \sqrt{(-1)^6}= 1$?
I think that it should be noted that $\sqrt{a^2} = | a |$. So, when you calculate $\sqrt{(-1)^6}$ you are doing something like this: $\sqrt{(-1)^6}=((-1)^2)^\frac{3}{2}=\left(\sqrt{(-1)^2}\right)^3=(|-1|)^3=1$
May
13
awarded  Caucus
Apr
10
comment How can I prove that $xy\leq x^2+y^2$?
Quite an elegant hint!
Oct
23
answered How to round 0.4999… ? Is it 0 or 1?
Oct
3
awarded  Commentator
Oct
3
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!