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 CloudFlare, 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 -
23 280
Alexa rank
Best pages on Mathoverflow.net
-
Q&A for professional mathematicians
-
Let $A$ be a $C^*$-algebra and $(a_{ij}) \in M_n(A)$ be a positive matrix. Does there exist a constant $C \ge 0$ (not depending on the $a_{ij}$) such that $$\lVert(a_{ij})\rVert \le C \Bigl\lVert\s...
-
Hottest Questions Today - MathOverflow
Skip to main content Stack Exchange Network Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, ...
Mathoverflow.net news digest
-
0 days
Daniel Kriz' work in prismatic and derived context?
Some hopefully not too nonsensical questions on Daniel Kriz' work (from just revisiting it after a very long delay, my excuses in advance):
Could one view Kriz’s period sheaves as prismatic crystals and connect his work to Fargues-Scholze geometrization via local Shimura varieties?... -
0 days
Prove $ReR=R$ where $R=\prod_{i=2}^\infty \mathbb{M}_i(S_i)$ and $e$ is a certai...
Let $\{S_i \}_{i=2}^\infty$ be a collection of rings. For each $i\geq 2$ let $e_i \in \mathbb{M}_i(S_i)$ be the idempotent whose (1,1)- and (2,2)-entries are $1$ and all other entries are $0$. Then $e:=\{e_i \}_{i=2}^\infty$ is an idempotent of $R:=...
-
0 days
Norm of an operator from norms of its real and imaginary parts
Let $A, B, A', B' \in B(H)$ be self-adjoint operators on a Hilbert space. Suppose $\|aA + bB\| = \|aA' + bB'\|$ for all $a,b \in \mathbb{R}$. Does this imply that $\|A + iB\| = \|A' + iB'\|$?
I think a positive solution would answer this question about operator systems.... -
0 days
Brown's twisting cochain and the homology of loop spaces
I'm sure this is a very silly question, but I'm not an expert so clarification would be greatly appreciated. Consider the path fibration $\Omega X \to PX \to X$. In his paper Twisted Tensor Products, I, Brown constructs a twisting cochain$$\tau : C_...
Domain history
| Web host: | CloudFlare, 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
ExcellentChild safety
Excellent
