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
  • English language flagLanguage: English
  • Last check:
  • 15 260

    Visitors daily
  • 54 936

    Pageviews daily
  • 6

    Google PR
  • 22 165

    Alexa rank

Mathoverflow.net news digest

  • 0 days

    Concrete examples of classifying spaces of simplicial groups

    I'm preparing a talk around Kensuke Arakawa's Classifying Space via Homotopy Coherent Nerve and would like concrete applications of classifying spaces of simplicial groups.
    Let $G \in \mathrm{Cat}_\Delta$ be a simplicial group, i.e. a simplicially enriched category with a single object $*$ and each $n$-simplex invertible in $G(*,*)$.Arakawa proves that the homotopy coherent nerve $NG$ given by$$ [n] \mapsto \mathrm{Cat...

  • 0 days

    On spaces of Laurent-type polynomials but involving fractional powers on a polyg...

    I am interested in a polygonal domain $\Omega$ in the complex plane. For simplicity, we may assume that its closure $\overline{\Omega}$ is compact (so it has no edges going to infinity, for example). Let the vertices be $z_i$ for $i = 1, \dots, n$. I...

  • 0 days

    Can every locally profinite group be constructed from discrete groups?

    Well known structure theorems for abelian locally compact groups show that every abelian locally compact group can be constructed from the groups $\mathbf R$, $\mathbf Z$, $\mathbf T$ and cyclic groups using the operations of finite products, projective...

  • 0 days

    Sum of parallelepipeds spanned by six vectors in $\mathbb{R}^3$

    Disclaimer(Cross-post): The question is somewhat related to the unanswered ms question 1
    Problem:Consider $x_1,\ldots,x_6\in \mathbb{R}^3$ such that $\sum_{j=1}^6\|x_j\|^2=3$. I want to prove the following: $$\sum_{1\leq i<j<k \leq 6}|\det(x_i,x_j,x_k)|\leq \sqrt{10+4\sqrt5},$$with equality occuring when $\pm x_1,\ldots,\pm x_6$...

Domain history

Web host: Stack Exchange, Inc.
Registrar: GoDaddy.com, LLC
Registrant: Registration Private (Domains By Proxy, LLC)
Updated: July 07, 2025
Expires: July 14, 2026
Created: July 14, 2009

Whois record

Visitor gender

Male

Female

Safety scores

Trustworthiness

Excellent

Child safety

Excellent