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Mathematics
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uforoboa
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I'm a poor little math student :)

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answer
158
$L^p$ and $L^q$ space inclusion
Sep 20, 2011
answer
51
Contest problem: Show $\sum_{n = 1}^\infty \frac{n^2a_n}{(a_1+\cdots+a_n)^2}<\infty$ s.t., $a_i>0$, $\sum_{n = 1}^\infty \frac{1}{a_n}<\infty$
Sep 25, 2012
question
45
Probability that two random numbers are coprime is $\frac{6}{\pi^2}$
Sep 14, 2011
question
36
thoughts about $f(f(x))=e^x$
Sep 19, 2011
answer
18
Proving inequality $\frac{a}{b}+\frac{b}{c}+\frac{c}{a}+\frac{3\sqrt[3]{abc}}{a+b+c} \geq 4$
Aug 31, 2012
answer
12
Why is $\sum \limits_{k = 0}^{n} (-1)^{k} k\binom{n}{k} = 0$?
Oct 25, 2011
answer
11
Computation of limit: $\lim\limits_{n \to \infty} \frac{1}{n}\left ( \cos1+\cos(\frac{1}{2})+\cos(\frac{1}{3}) +...+\cos (\frac{1}{n}) \right )$
Jan 28, 2013
answer
11
Trouble with an Inequality
Nov 16, 2011
answer
11
orthonormal system in a Hilbert space
Sep 16, 2011
answer
10
Why is a finite integral domain always field?
Sep 7, 2011