MathOverflow
Math Overflow. Q&A for professional mathematicians.
Read Mathoverflow.net news digest here: view the latest Math Overflow articles and content updates right away or get to their most visited pages. Mathoverflow.net belongs to a group of fairly successful websites, with more than 458K visitors from all over the world monthly. It seems that Math Overflow content is notably popular in USA, as 32.4% of all users (148K visits per month) come from this country. We haven’t detected security issues or inappropriate content on Mathoverflow.net and thus you can safely use it. Mathoverflow.net is hosted with Stack Exchange, Inc. (United States) and its basic language is English.
Content verdict: Safe
Website availability: Live
Language: English
Last check:
-
15 260
Visitors daily -
54 936
Pageviews daily -
6
Google PR -
20 757
Alexa rank
Best pages on Mathoverflow.net
-
Q&A for professional mathematicians
-
Hottest Questions Today - MathOverflow
Skip to main content Stack Exchange Network Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, ...
-
I hope everyone is doing well. Let $K \subset \mathbb{R}^n$ be a centrally symmetric convex body $(K = -K)$. Denote by $K \mid H$ the orthogonal projection of $K$ onto $H$, where $H$ is an $n - 1$
Mathoverflow.net news digest
-
0 days
Are there still personal professional addresses?
My university has decided that from now on there will be no personal (snail) mailboxes for individual faculty members. Each department as a whole will continue to have its own mailbox.
Of course, each of us is supposed to list his or her professional address on our publications so as to identify the university where we work, for the greater glory of the university. However, mail sent to such an address will not arrive to the individual... -
0 days
On the sum of divisors of powers
Is there at least one prime $q$ such that $\sigma{(q^{p-1})}$ assumes infinitely many composite values, as $p$ ranges over the primes? If $q=2$, we get the Mersenne numbers, $2^{p}-1$.
-
5 days
Density of good approximations of irrational torus rotations
Given an irrational rotation $\omega \in \mathbb T^d$, we may define the set$$S_\gamma = \{m \in \mathbb Z^d: \|\langle \omega,m\rangle\|_{\mathbb T} < |m|^{-\gamma}\},$$and the densities$$A_\gamma(N) = \{m \in S_\gamma : |m| \leq N\}.$$I am particularly...
-
7 days
Is "no incomparable embedding phenomena" equivalent to some congruence-theoretic...
I suspect that I'm missing some category theoretic/universal algebraic terminology which would make this question more efficient. Feel free to edit to include that!
Given a variety (in the sense of universal algebra) $\mathbb{V}$ and a set $X$, let $\mathbb{V}(X)$ be the set of $\mathbb{V}$-algebras with underlying set $X$. Say that a a $(\mathbb{V},X)$-umbrella is a pair $(M,(f_A)_{A\in\mathbb{V}(X)})$ where $M...
Domain history
| Web host: | Stack Exchange, Inc. |
| Registrar: | GoDaddy.com, LLC |
| Registrant: | Registration Private (Domains By Proxy, LLC) |
| Updated: | May 11, 2026 |
| Expires: | July 14, 2026 |
| Created: | July 14, 2009 |
Whois record
Visitor gender
Male
Female
Safety scores
Trustworthiness
ExcellentChild safety
Excellent
