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33 votes
8 answers
1k views

We have our first user with more than 200K reputation!

Congratulations to Joel David Hamkins who on (I think!) the 27th November 2022, was the first MathOverflow user to pass 200k reputation! Since Joel joined on the 19th November 2009, he has supplied ...
21 votes
2 answers
338 views

ChatGPT strikes MathOverflow

The user (or a bot) https://mathoverflow.net/users/496085/canvas123 appears to be posting ChatGPT-generated text on MathOverflow. Two “answers” by this user already got accepted (!): When is a ...
132 votes
59 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? ...
5 votes
1 answer
242 views

Any chance of a "save for later / TODO" feature?

Sometimes when browsing MO questions I have the need to "save for later" for various reasons. There is a star for favoriting questions, it would be very useful to have "TODO" labels beyond just the ...
3 votes
2 answers
145 views

Removing "tag-removed" tag

Currently, contra its intention the "tag-removed" tag has more than $300$ associated questions, many of which are upvoted and have actually contentful tags. This seems like a situation ripe ...
8 votes
1 answer
114 views

Mathoverflow for finding the name of mathematical concepts

I am used to posting on MathOverflow problems with questions. However, now I am looking for the name of a mathematical object that I think already exists (and I would be happy to find reference ...
16 votes
1 answer
315 views

Creation of "procrastination" tag

One user has created the tag procrastination: see this question. In principle I would have immediately deleted it as totally irrelevant (in the same way I would delete "Stupid question" or &...
15 votes
3 answers
1k views

Frequently asked questions about tagging on MathOverflow

Due to several discussions on the main site, I am asking this question concerning the best practices for tagging questions on MathOverflow. Unfortunately, the relevant documentation page https://...
36 votes
5 answers
4k views

History of MathOverflow

What is history of this site? When and by whom was it created? What were the important milestones of this site?
4 votes
1 answer
167 views

The tags (publishing) and (journals) - maybe change direction or cancel the synonym

At the moment there is a synonym publishing $\to$ journals. (With the tag journals as the master tag.) I think that at least for some questions tagged journals: Using a tag called publishing might be ...
3 votes
1 answer
86 views

Integral sign cut off in Safari

I am using Safari version 16.1 with the HTML-CSS renderer. A displayed formula in the post Convergence by parameter involving inf renders as follows: This happens even with extensions disabled, but ...
6 votes
1 answer
1k views

Registered vs. unregistered users?

What does it mean if a user is unregistered? I'm interested in the questions and answers of a particular user, let's say "SAM". I clearly see questions that SAM has asked, but when I search for "SAM"...
4 votes
1 answer
68 views

Occasional "echoed" usernames in Firefox

I noticed about a month ago that quite often in the latest version of Firefox (but not in Chrome) under Windows 11 usernames become distorted like this Does anybody else see this or it is just me? ...
6 votes
0 answers
196 views

Did mathcal stop working properly?

Does this question Basic algebra of $\mathcal{O}_0(\mathfrak{sl}_n(\mathbb{C}))$ — Reference request look like this for anyone else?: Those squares are supposed to be \mathcal{O}'s. As far as I can ...
2 votes
1 answer
2k views

What happened to the stack exchange app for iOS?

The stackexchange app would no longer launch, I tried to reload it from the Mac App Store, and it’s not there (or at least, I could not find it). I probably missed some event, is there an alternative?
16 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 ...
7 votes
1 answer
468 views

JavaScript loading problem

In my hotel in Shanghai, I get the error message MathOverflow requires external JavaScript from another domain, which is blocked or failed to load. Is there a work around for this? Posts load very ...
16 votes
23 answers
3k views

Help improve tagging!

Please help by writing tag wikis for your favorite tags! Use answers to this post to suggest tag synonyms. Finally, if you're a 10k+ user, note how easy it is for you to edit tags now!
9 votes
0 answers
271 views

New tag for "stochastic partial differential equations" (SPDEs)

Since there are separate tags for a) ODEs, ca.classical-analysis-and-odes and differential-equations and for b) ap.analysis-of-pdes but only one tag for stochastic-differential-equations, I was ...
7 votes
1 answer
157 views

Interesting question deleted by author — how to reach out to author to ask to undelete?

"Coloring Gaussian integers based on a numeral system based on powers of $-1+i$" was an interesting question that was recently asked. I left a comment with some relevant keywords and links (...
3 votes
0 answers
150 views

Wrong rendering in narrow width in Safari

When I view the front page right now in Safari, I see: Notice that the question mark, which the poster properly placed at the end of the equation (see the question (before another edit removed the ...
4 votes
1 answer
66 views

What is a supported use of \hfill?

According to Supported TeX/LaTeX commands, \hfill is supported. However, as expected, it doesn't work in ordinary text \hfill ; and using it in math mode seems to ...
2 votes
0 answers
124 views

Facebook and Twitter links disappear ungracefully

I am using Safari 16.1 on macOS 12.6. The invitation to "Share a link to this question" appears for me like this: I assume that the Twitter and Facebook links are not showing because of ...
2 votes
1 answer
210 views

Why is this question locked?

This question has only two downvotes, which is not enough to keep it off the front page. I'd therefore like to downvote it, but can't, because it is locked for mysterious reasons. Because this does ...
-6 votes
1 answer
245 views

Where did the reputation go?

Some time ago, it was decided that reputation should no longer be displayed by default, but users had the possibility to opt in to see it, as explained by Ben Webster. I had opted to see reputation, ...
4 votes
1 answer
377 views

Migrated question returned to MO - how to handle?

The question I am referring to is Is all complicated modern math intuitively understandable? (See the user's math.SE account to see that the question was at one point migrated to math.SE.) I think the ...
6 votes
2 answers
2k views

Numbering and cross referencing of equations in questions and answers

A basic LaTeX feature which I sometimes miss when asking and answering questions in MO (specially when the question and the particularly the answer are longer) is the possibility of numbering ...
-5 votes
2 answers
455 views

If it doesn't interest you, don't read it!

As an algebraist, if I see an analysis question on Mathoverflow that falls outside my expertise, I probably won't read it in details, and if I do read it, I certainly won't judge its "level",...
7 votes
8 answers
1k views

Specialized chat rooms

Would there be an interest in having more specialized chat rooms, like the one for homotopy theory that currently exists? So far, the homotopy theory one seems to be fairly successful, and it seems ...
11 votes
4 answers
489 views

What to do with the erdos tag?

This was discussed before but that discussion is outdated. Tags related to a specific person are generally bad. (This is not the same as specific topics named after a person, e.g. Galois theory is not ...
14 votes
1 answer
350 views

Why was my question deleted?

Why was my question Is the Frog game solvable in the root of a full binary tree? deleted? It was a cross-post, but I followed all recommended advices when doing so. It was also decently upvoted (12+). ...
54 votes
41 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 ...
46 votes
0 answers
1k views

2022 Election results: Congratulations to our new moderator!

The election is over, the votes have been counted, and on behalf of the current team and board, I'd like to welcome David Roberts to the moderators team! I'd like to thank Carl-Fredrik Nyberg-Brodda ...
7 votes
1 answer
524 views

2022 Community Moderator Election

The 2022 Community Moderator Election is now underway! Community moderator elections have three phases: Nomination phase Primary phase Election phase Most elections take between two and three weeks, ...
19 votes
2 answers
958 views

Nominating other community members

Is there no mechanism to suggest other community members for nomination? If I remember correctly, last election there was some mechanism in place to suggest community members other than ourselves who ...
14 votes
0 answers
204 views

Which questions should be tagged “reference-request”?

The reference-request tag is currently described as: “this tag is used if a reference is needed in a paper or textbook on a specific result.” I have found current usage of this tag too broad to be ...
17 votes
1 answer
681 views

MathOverflow conferences

What would the appropriate initial steps be to host a MathOverflow conference? Back in 2019 I hosted a party for the 10th anniversary of MathOverflow, and it was a blast.$^*$ Since then I've ...
3 votes
1 answer
87 views

Edit history lost on migration

According to a comment, @Marco's answer to Notation about n choose k permutations was edited before migration. However, nothing displays in the edit history. (This seems appropriate to ask here since ...
31 votes
111 answers
12k 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" ...
3 votes
0 answers
141 views

Weird site URLs

If I go to MathOverflow from another SE site by clicking on the link in “Your Communities” under the right-most menu on the top-bar, I do not end up with the usual ...
-13 votes
2 answers
571 views

Why my nomination for 2022 Community Moderator Election withdrawn without convincing reason?

I was honored to participate in the elections for moderation in MO 2022 , but I am sorry to say that my candidacy was withdrawn today without any convincing reason, frankly, I did not find it ...
4 votes
0 answers
264 views

Can I ask this question on Math Overflow? (Advice on how to get started)

I am thinking of applying for a maths PhD programme. I have more or less an idea of the subfield I'd like to research, but not much more than that. I'm looking for suggestions on how to properly ...
18 votes
11 answers
871 views

2022 Moderator Election Q&A – Question Collection

The purpose of this thread was to collect questions for the questionnaire. The questionnaire is now live, and you may find it here. MathOverflow is scheduled for an election next week, 2022-09-19. In ...
25 votes
4 answers
1k views

Examples of mathematical exposition arising from MO answers

I could imagine that several very long Mathoverflow answers have eventually turned into expository papers. For example, I have posted this (unpublished) expository paper on the arxiv about various ...
3 votes
2 answers
185 views

Should we allow link-only answers that point to stable, well known and respectable sites?

I have just been presented with an answer in the VLQ queue that consisted essentially in a link to a preprint on arXiv. The user having posted it is a high reputation user, so he definitely knows the ...
5 votes
0 answers
210 views

Partial answer accepted, thinking it could have been easily extended and provided enough insights

Some days ago I posted a question and I accepted an answer, "although it’s only a very partial answer," as the answer author wrote in a comment. I accepted it because I thought that it ...
2 votes
2 answers
678 views

Triangle commutative diagram does not work here at MO

I frequently tried to draw a triangle commutative diagram similar to the definition of projective modules for this question. A module associated to an endomorphism of a vector bundle so I ...
0 votes
0 answers
146 views

Asking if a post about a mathematical characterization of gravitational geons can be potentially interesting for the main site MathOverflow

I would like to ask about if a question about the following subject can be potentially interesting and on topic on MathOverflow. I would like to ask on the main site of MathOverflow about the ...
24 votes
4 answers
780 views

What is the deal with changes to the front page?

It appears that today Stack Exchange has changed the appearance of the MathOverflow front page. It now looks more similar to Stack Overflow. The most noticeable change is that the counts of answers, ...
1 vote
1 answer
79 views

Long post fails to render

In one MathOverflow answer by me, the MathJax code added latest fails to render correctly. Instead, one $ tag is ignored and for the rest on the line, code inside <...

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