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Oct
12
answered Matrix multiplication: is C(AB) the same as (CA)B?
Oct
12
comment Can I use my powers for good?
You could give advice to people in debt or tutor students from bad high schools. But I guess that you forgot to mention what your minimum requirements are for salary and lack of boredom.
Oct
12
answered How do I evaluate the Complex Integral $(z^{-n})/(e^z−1) $ using residue theory?
Oct
11
comment When does $a + b$ divide $a^p + b^p$?
If the gcd of a and b is not 1 or p, then the statement is obviously wrong.
Oct
11
answered Why does $a^n - b^n$ never divide $a^n + b^n$?
Oct
11
answered When does $a + b$ divide $a^p + b^p$?
Oct
11
comment Mathematical explanation behind a picture posted (lifted from facebook)
I think that this would make a fine question for the proposal area51.stackexchange.com/proposals/4955/popular-natural-science so I invite you to support the proposal.
Oct
11
comment How to solve such an equation ? (Line-Plane Intersection)
What do you mean with "solve"? Do you want to calculate $t$? Do you know the relation between the V and the x, y, z?
Oct
10
comment How to compute the limit of this integral?
For large n and x smaller than 1- epsilon, $x^n$ is small, for small argument, the function is near $f(0)$.
Oct
10
comment Simplifying a series
It is a geometric series.
Oct
10
answered How to compute the limit of this integral?
Oct
10
comment What's the lower bound of the sum $S(n) = \sum_{k=1}^n \prod_{j=1}^k(1-\frac j n)$?
Is $i=k$ ? (not enough characters)
Oct
10
comment Marble game theory
@Brian M.Scott Note that the IMO problem has two parts. The first part is about emptying just one of the three accounts which is exactly equivalent to making two accounts the same size.
Oct
9
comment Marble game theory
Positive is also not always advisable as there are languages/countries where 0 is positive and negative.
Oct
9
revised Marble game theory
added 411 characters in body
Oct
9
answered Easy system in five equations
Oct
9
answered Marble game theory
Oct
8
awarded  Benefactor
Oct
8
answered Eulerian path - disconnected graph
Oct
8
awarded  Vox Populi