Mathematics
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fedja
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43
What is the simplest lower bound on prime counting functions proof wise?
Aug 13, 2016
answer
40
What's the sign of $\det\left(\sqrt{i^2+j^2}\right)_{1\le i,j\le n}$?
Dec 18, 2020
answer
22
Math contest: Find number of roots of $F(x)=\frac{n}{2}$ involving a strange integral.
Oct 24, 2012
answer
21
If $\int_{\mathbb R^2} \frac{\vert f(x)-f(y)\vert}{\vert x-y\vert^2}dxdy<+\infty$ then $f$ is a.e. constant
Oct 30, 2013
question
18
Need a *trivial* proof of an "obvious" combinatorial result
Dec 7, 2017
answer
18
Is the series $\sum_{i=k}^\infty\frac{\sin\left(\frac{x}{i}\right)}{i}$ bounded?
Jul 28, 2021
answer
17
Optimizing response times of an ambulance corp: short-term versus average
Nov 8, 2012
answer
15
Level of Rigor in Mathematical Physics
Aug 21, 2013
answer
15
How to say $(a,b]$ and $[a,b)$ in English?
Sep 6, 2013
answer
15
Why can't $p^p-(p-1)^{p-1}=n^2$ be a square?
Oct 31, 2015
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Is $ \sum\limits_{n=0}^\infty x^n / \sqrt{n!} $ positive?
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How To Present Mathematics To Non-Mathematicians?
85
What's a nice argument that shows the volume of the unit ball in $\mathbb R^n$ approaches 0?

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