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-2 votes
0 answers
33 views

How to prove this (corollary of) hyperplane separation theorem? [closed]

$X$ is a nonempty convex subset of $\mathbb{R}^n$ whose element is $x=\left(x_1,...,x_n\right)$. The theorem is as follows. If for each $x\in X$, there is an $i \in \left\{1,...,n\right\}$ such that $...
15 votes
1 answer
704 views

Should moderators in some cases remove a question from the network-wide hot questions list?

Not too long ago - in March 2019 - some changes have been made to the Hot Network Questions (HNQ). Some of the new features are the limit on the number of hot questions from a single site, or limit on ...
3 votes
1 answer
169 views

Is there a way to `@` exactly one of two users whose names differ, if at all, only by whitespace?

I recently approved an edit to Zeroes of characters of general linear group induced from certain characters of parabolic subgroups by user @math seeker. I approved the edit, which was otherwise ...
31 votes
110 answers
11k views

Requests for reopen and undelete votes for closed and deleted questions

Since I expect this may prove rather useful, I'm blatantly purloining Asaf's question from meta.math.se. Please post general requests for reopen votes as answers below. Beware that "short" ...
2 votes
2 answers
106 views

When, precisely, should history of math questions be CW?

I don't have much experience with "history of math" questions or the ho.history-overview tag. I tried to distill an answer to my question from looking at existing questions, but failed to ...
130 votes
58 answers
18k views

Best of MathOverflow, or papers inspired by MathOverflow

This is a place to collect MathOverflow success stories! Was some of your research inspired by something on MathOverflow? Do you know questions & answers that led to interesting research? ...
7 votes
1 answer
180 views

Reputation number not visible on main page

This is a very minor bug, but the reputation number seems not to be visible on the main site: Interestingly, it is visible in meta:
1 vote
1 answer
297 views

What about talking about life? How to work, manage, organize, and so forth?

My question comes from a general an recurrent observation on MO (and more generally in the real academic life): doing research (in mathematics) is a whole ecosystem, full of different tasks and ...
4 votes
0 answers
59 views

Occasionally reproducible bug with macro definitions in a draft post affecting macro use in comments

In the course of a discussion involving using MathJax to re-define macros, I couldn't recall if MathJax obeys a \newcommand for an already-defined macro, and so ...
6 votes
4 answers
1k views

Formatting Sandbox

The purpose of this thread is to enable people to check if their formatting works and to play around with their MathJax code. Quoting from Bill Dubuque's Formatting Sandbox on meta.math.SE: To use ...
3 votes
1 answer
182 views

Hyperlink in a comment?

How do I add a link to an external published article in a comment? I don't see the edit frame with the link button. What is the syntax I can use? (I did search Meta but did not see ...!)
15 votes
4 answers
760 views

Hiding reputation

In MathOverflow 1.0 we had the ability to hide other users' reputations. Can we get that again? (Also, I had to rewrite this question several times to get past an annoying box that said my question ...
2 votes
0 answers
103 views

Planar geometry on MO

"Planar geometry" here is 2-dimensional Euclidean geometry, usually used as Olympiad geometry problem, its objects just be a bunch of lines and circles, it has no Combinatoric aspect and not ...
10 votes
0 answers
316 views

To which extent should spam posts on meta be considered a problem?

MathOverflow is one of the few sites in the Stack Exchange network where users with reputation 1 can post on meta.1 Clearly, this has some advantages2 and some disadvantages. Probably one of the ...
-8 votes
0 answers
222 views

Why so much downvote on my research?

So I replaced the sum for an integral in the matrix product, creating a product for real differentiable manifolds with rectangular domain. I asked questions about it and got lots of downvotes. Why is ...
7 votes
1 answer
309 views

Comment / Down-vote / Vote to close -- in what order, with what delay?

If I see a post that I think belongs on MathStackExchange, what should be my first response? a) Comment to the user b) Down-vote c) Vote to close with suggestion of migration And how long should I ...
4 votes
3 answers
344 views

Is asking for good review papers a good question?

I think that generally speaking asking for papers might be a non-research issue. If it's merely a google issue, then it shouldn't be in MO. What about Survey/Review papers? Obviously those are hard ...
3 votes
1 answer
94 views

Why is there unexpected space at the beginning of a paragraph in an answer?

In @GabeK's nice answer to @JonBannon's question Each mathematician has only a few tricks, there is unexpected space at the beginning of the third paragraph: My first thought was that there might be ...
10 votes
4 answers
250 views

Is it possible to see the source for a comment?

Although this question seems to be new to M.MO, @MartinSleziak points out several related posts on Meta.MSE. I was curious about the diagrammatic magic of @YaakovBaruch's recent comment, and so ...
14 votes
2 answers
842 views

Revamping the closure reasons in 2022

Prompted by Gro-Tsen's recent meta question, it appears that now may be a good time to rethink our site-specific close reasons here on MathOverflow. Background: If you have sufficient rep, you can ...
8 votes
2 answers
451 views

Are there policies to respect in order for MathOverflow Q&As to be tracked back in relevant zbMATH Open reviews?

Are there policies to respect in order for MathOverflow Q&As to be tracked back in relevant zbMATH Open reviews? I am asking this since I noticed that all questions and answers to which I ...
11 votes
2 answers
510 views

Questions about correctness of published papers

A recent thread brought up the issue of the appropriateness of discussing correctness of a published paper on MO. Correctness of Thierry Aubin's argument about positive Ricci curvature I did a ...
4 votes
3 answers
625 views

Local vs. Global MO in relation to "Polymath" efforts

Certain polymath-flavor questions appear on MO, and are not really appropriate for the forum. Such questions are probably posted (I can only be sure for my own such posts) because MO captures a huge "...
54 votes
39 answers
26k views

News of potential interest to the MO community

Occasionally, there has been a suggestion to start a meta question to collect information that might be of interest to the MO community. This is an attempt to start such a thread. Is there any news ...
1 vote
1 answer
85 views

Icons for MO/metaMO in community list changed?

I notice that in the community list under the SE hamburger in the top right, the icons for MO and for meta have changed: clearly having the MO logo attached to meta.math.SE is an issue, but we are ...
5 votes
1 answer
133 views

Serial voting was reversed

I was recently noticed "serial voting was reversed" on MO. I am curious about how this works, and what this exactly means (I don't have the feeling that I did something wrong). Note that I ...
12 votes
1 answer
530 views

Was the custom close reason mentioning Math.SE removed?

For a long time, these two custom close reasons used to be available: This question does not appear to be about research level mathematics within the scope defined in the help center. MathOverflow ...
15 votes
4 answers
2k views

Should there be any concern about the number of questions imported into PhysicsOverflow?

I just happened to note that http://www.physicsoverflow.org/ now exists; this isn't a stackexchange website, but seems to run on similar software, and with similar goals to mathoverflow, which seems ...
26 votes
5 answers
2k views

Updated: Is it time to replace links to the UCDavis arXiv frontend?

This question from March 2020 points out that many questions/answers link to papers at the http://front.math.ucdavis.edu/ frontend instead of at the arXiv itself, but that the frontend had been down a ...
19 votes
2 answers
867 views

Can (and should) Project Euclid links be replaced in bulk?

In February 2021, Project Euclid made some changes on their website: Project Euclid Platform Migration FAQs. It is probably a consequence of this that the links starting with ...
4 votes
0 answers
128 views

Can we recover old MathOverflow Meta "Tea" discussions?

Today I flagged a question as needing to be made community wiki. I thought about why, and found this old question of mine here. Carlo Beenakker helpfully linked to a thread on the old tea. Link ...
8 votes
1 answer
526 views

When answers are primarily opinion based, should the question be CW?

A question was just asked about whether or not we still need model categories of spectra (vs working with the $\infty$-category). To me (and Fernando Muro at least), it is reminiscent of a previous ...
11 votes
0 answers
352 views

Keeping a question on track or allowing people to chime in with stuff they'd like to mention?

I am slightly unhappy with the direction of drift to answers to this question. On my reading, the OP mentioned a phenomenon and asked how editors should react to it. This seems to have been taken by ...
0 votes
1 answer
214 views

Why are some non-research questions so highly upvoted?

It is not difficult to find soft questions on the website which do not clearly strike as research level. To give examples of some: 1, 2, 3, 4, 5. Yet some of them are upvoted so highly that even many ...
11 votes
0 answers
256 views

New community close vote reason

While doing some cleanup on the home page just now, I noticed that we have a new community specific reason to close. The second option in the list is new, and leaves me slightly confused. While I ...
8 votes
2 answers
462 views

Flagging Low Quality Questions

For questions of extremely low quality that are sure to get closed anyway, do the moderators still want flags? Or is that just cluttering up their mailboxes to no purpose?
6 votes
2 answers
333 views

Citing papers in questions/answers

Is there an established policy for how to cite a paper you link to in a question/answer? If not, what does etiquette dictate appropriate for citations? I used to be careful to include full citations ...
22 votes
5 answers
2k views

How should we react to the existence of Math Educators SE?

As was previously announced at meta, there is now an SE site for mathematics education (MESE). My broad questions is this: Should we react to this somehow? (More specific questions are below.) Does ...
31 votes
10 answers
3k views

What MO is for and what is *your* aim in participation?

Q1: What is your view on the purpose, aims and benefits of MO? Q2: What are your specific aim, targets and benefits in participation at MO?
16 votes
0 answers
604 views

Recurrent posting about «Matrix polynomials» and so on

MO is currently being the focus of what I guess to be a single particular individual R.T.Man sporting multiple unregistered users identity (like Eskand or H.night). S/he's asking multiple very similar ...
7 votes
1 answer
371 views

How to make it easier to moderate blatantly off-topic questions?

As many of you have noticed, there's a lot of new users asking basic mathematics questions. This is not the only site in the network with this kind of problem; on Meta Stack Exchange we get all kinds ...
5 votes
6 answers
554 views

I have a question which is a near fit for MathOverflow. What are some other resources I might consult?

What are some other resources which might be useful for somebody considering asking a MathOverflow question, especially if their question is not quite a perfect fit here? In asking this, I have ...
3 votes
3 answers
664 views

Has MO traffic decreased a bit since the invasion of Ukraine?

I check the review queues several times a day, each day. I have noticed a significant drop of posts in the queues that I am watching (First questions, First answers, LQP, Late answers). Even the ...
1 vote
1 answer
119 views

Downvote and vote to close of a recent question

I recently asked the following question on God's number for higher dimensional sequential move puzzles. It was downvoted once and has a vote to close, even though it is in my eyes a perfectly good ...
9 votes
1 answer
256 views

Editing old question, can't submit as title is too long

I'm editing Is there a canonical map from the cohomology of orbifold Chiral de Rham on an orbifold to the cohomology of Chiral de Rham on a crepant resolution? as there was a broken arXiv Front link (...
11 votes
1 answer
508 views

Could we add another reason for closing that's more appropriate for "check this (dis)proof of RH"-type questions?

I wanted to vote to close this question which claims to disprove the Riemann Hypothesis, but I realized that, even though we get questions of this kind occasionally, none of the reasons to close is ...
9 votes
6 answers
415 views

Revising the help page on "What topics can I ask around here?"

This is a freestanding post taking its content from a previous discussion on the modal window for first-time askers. Thanks to Martin Sleziak and Tim Campion for the encouragement to post it ...
12 votes
2 answers
299 views

Filtering out the Autobiographer badge from "Recent Badges"

As discussed in this recent post, there is currently an influx of a ridiculous number of profile spammers showing up with the Autobiographer badge in the "recent badges" box on the MO ...
30 votes
2 answers
850 views

Reputation and badges are no longer visible next to the users' names

Right now it seems that a bug is affecting MO: reputation and badges are no longer displayed next to the users' names. This happens both on the front page: as well as on pages of individual questions:...
3 votes
0 answers
145 views

Would this question be appropriate on the main site?

I would like to ask a "big list" style question on the main site. The question would be "How do we pronounce the names of famous mathematicians?". Each answer would be an audio ...

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