All Questions

Filter by
Sorted by
Tagged with
5 votes
1 answer
288 views

Once a thread is deleted, is it really too late to bring it back?

I was under the impression that "deleted" threads were still visible by moderators or other high-level members of the community. Is this correct? If a post was deleted that shouldn't have ...
4 votes
2 answers
142 views

"Scope" of being blocked from asking

As you know well, when one attempts to delete a question that has already received an answer, the following message is displayed. "Repeated deletion of answered questions can result in your ...
0 votes
2 answers
216 views

A question of notation: what does $x\lt y\in S$ mean? [closed]

I've seen expressions like $x\lt y\in S$ used on this site to mean "$x\lt y$ and $x\in S$ and $y\in S$." This has me worried because I sometimes use $x\lt y\in S$ to abbreviate "$x\lt y$...
1 vote
0 answers
84 views

Appropriateness and cross-posting

I am interested in this question on math.stackexchange. To me it is interesting because while it looks "obvious" that there isn't a solution with 6 turns (I have some very partial results ...
12 votes
1 answer
262 views

Should we have a tag for second-order logic?

There are a number of questions on this site about second-order logic (admittedly I may have asked a few more of them than is reasonable). For example, searching "second-order logic" (in ...
8 votes
5 answers
269 views

Is it possible to temporarily comment out part of a post?

Scenario (true story): after posting something I became doubtful about certain claim there, so I want to hide it until I clarify my doubts. Of course I could just move that part to a temporary file, ...
3 votes
1 answer
77 views

`\DeclareMathOperator` at the beginning of a comment disables some link parsing

In a comment of the form $\DeclareMathOperator\a{a}$Here's a [link](http://mathoverflow.net) and [another link](http://mathoverflow.net) $\a$, neither link is ...
0 votes
0 answers
78 views

Can I ask for advice or opinions about the choice of a variant of a theory?

Basically, I have 2 versions of a theory. This is like having two competing theories of complex numbers, one where $i^2=-1$ and the other where $j^2=1$ (hyperbolic numbers) or extending reals with $+\...
-8 votes
1 answer
161 views

Is it allowed to use images for pasting math formula?

Is it allowed to use images to paste math formula in mathoverflow.net ? I think this is high efficiency, and few people search math questions by LaTeX.
1 vote
1 answer
88 views

Question visibility and reputation

I wonder whether the visibility of a post changes according to the user's reputation asking the question. Is it also known if a user's posts' visibility is affected by other actions, like having ...
25 votes
23 answers
3k views

Help cleanup tags!

This is meant to agglomerate tags that need (occasional or regular) cleanup. That is tags that mean multiple unrelated things and need to be separated into more specific tags. Please follow the ...
11 votes
0 answers
386 views

Utility of Mathematics: Is this question appropriate here, and if not/if so, how can I phrase it better?

I would like to know if this question is appropriate for Math Overflow, and if so, how I can phrase it better to get the best results. Question: I recently spoke with a very nice mathematician who ...
4 votes
0 answers
343 views

Question on topic for Mathoverflow?

My question, asked months ago, was well received. Now... I'm wondering if this question is on-topic for MathOverflow: Consider a semi-Riemannian manifold $\zeta^{2,2}$ with metric, $g=\frac{dxdy}{xy}+...
2 votes
1 answer
235 views

Questions seemingly/apparently/ostensibly too elementary for overlfow

Well I don't really get notifications of flag responses sooo... Nov 6 at 14:01 helpful - I suggest you take this up in meta; there is not enough space to answer here. But there are a number of ...
0 votes
0 answers
97 views

Please help me improve my Q&A and possibly reopen certain questions

Prepare to downvote me. But don't think of not downvoting me just because I pre-emptively self-deprecated myself to put a show of humility. Just pretend I'm as arrogant as I may be perceived to be in ...
1 vote
0 answers
62 views

Why is the ‘mathematical logic’ tag spelt [lo.logic]? [duplicate]

On MathOverflow, questions about mathematical logic bear the tag lo.logic, which has a synonym of logic. Where did this lo.logic spelling come from? Why is it not ...
13 votes
0 answers
807 views

Vandalism edits by apparently-anonymous users

There is an answer to an old community wiki question that was edited about 45 mins ago to make it sexually explicit, with a second attempted edit pending approval to make it even more so. I rejected ...
2 votes
1 answer
107 views

Is linking to comments possible?

I vaguely remember seeing links to comments somewhere, was it a dream or it is indeed doable?
4 votes
2 answers
86 views

How to tell who created a tag?

The "stats" section of a tag's page says how long the tag has existed, and the tag description history says who created the tag description. However, I don't see how to find who created the ...
3 votes
2 answers
252 views

How can this question have more downvotes than views?

An off-topic question recently appeared on the main site. It was heavily downvoted and got deleted after only a few minutes. But at one point before the question was deleted, I noticed it had been ...
23 votes
4 answers
2k views

Are professional Physicists, Computer Scientists, Engineers, Economists... not allowed to ask questions at MO?

"MathOverflow is a question and answer site for professional mathematicians." May other professional researchers ask questions at MO? Should they check their credentials at the door? If not, and ...
6 votes
3 answers
373 views

How do I link to a MO answer?

Sometimes you see in answers or questions a link to an earlier answer to a different question. The url often is a mysterious sequence of digits and letters. How is it obtained? Linking to a question ...
-1 votes
1 answer
110 views

Site for reviewing articles, formulas, theorems, etc?

This question might be weird, I wouldn't feel bad if it is closed. I know that MathOverflow is for mathematicians and math StackExchange for people studying math at any level. But questions like "...
14 votes
2 answers
454 views

Is there left any way to highlight part of text after all?

Currently we have quotes, but the quoted text looks more faint than the surrounding text The vertical bar hardly helps, I believe. In fact I think (although I cannot explain it) that this bar ...
0 votes
0 answers
89 views

Why did my profile picture disappear?

I discovered few days ago that my profile picture is gone, had to reupload it. Did anybody else encounter this? Do you know the reason?
-1 votes
1 answer
254 views

Are new users with inappropriate questions given help or rudely dismissed?

I often see questions like this: co.combinatorics - Given index $i$, what element is at position $i$ in sorted subsets that are obviously better suited for the Math.SE site. This particular question ...
6 votes
2 answers
352 views

Creating theories-of-arithmetic logic tag

It seems to me that a tag for "arithmetic logic" is missing while it concerns a significant number ($\sim 500?$) of questions, which currently have no common tag other than the very broad lo....
10 votes
0 answers
532 views

Bounty awarded to an immediately deleted answer

Something peculiar has just happened. A week ago a 300 point bounty has been added to this question (I think its content is hardly relevant to this meta question) [note: the bounty was added by a user ...
0 votes
0 answers
186 views

I want to answer a closed question

Please reopen this question: A problem of an infinite number of balls and an urn I have a nice answer. (Added (DR): now re-opened. Please note there are ten deleted nonsense answers, which I imagine ...
6 votes
0 answers
251 views

Platform-wide suspenson but not on MO?

At this closed question the user seems to be playing ignorant, but I looked at their network profile and some of the other StackExchange sites, and there is a prominent banner This account is ...
-1 votes
2 answers
152 views

Should "does anyone access this paper" questions be community-wiki?

Should questions consisting in barely asking for a copy or link to some given paper be community-wiki? A recent example, among others, is and Reference of J.L. Waldspurger's paper on Shimura ...
5 votes
0 answers
78 views

Dollar sign in image title works in preview, but not in actual post

I was just trying to clean up Understanding why $\pi_{3}(N) = \mathbb{Z}_{(2n, n^2)}$? , which was originally almost entirely cut-and-pasted images without any alternate text. For the first image, I ...
10 votes
0 answers
304 views

What should you do if you find old duplicates?

Sometimes I discover that "old" MO questions are duplicates of even older MO questions. Two examples: Embarrassingly, I found out that my own question: Formula for number of permutations ...
16 votes
5 answers
1k views

Do we have an unofficial quota on how many old questions one should bump for minor edits in a single day?

I noticed tonight that a well-intentioned user has been doing a lot of minor edits of formatting of old questions with the effect of filling most of the active question list with old questions bumped ...
43 votes
4 answers
2k views

MO "memorial" questions

In the past, when a famous mathematician passes away, many community members feel that they should be remembered on MathOverflow in some way or another. For obvious reasons, such memorials need to be ...
2 votes
0 answers
257 views

Is asking about name of a curve a research level question?

In my opinion this post is not a research level topic but surprisingly it has been received 22 votes. Is the linked post a research level question and appropriate for MO? I think it is more ...
14 votes
1 answer
345 views

Any policies around Dead links?

I have been reviewing a lot of older posts (~10 years old) and there are quite a few with links that are either dead or links that point to sites that no longer contain the relevant information that ...
14 votes
1 answer
317 views

Can I retag questions to get a topic badge?

This is just something I was wondering: I currently have 19 non-CW answers in real-analysis. Could I just go through my old answers looking for a question which involves real analysis but hasn't been ...
45 votes
6 answers
2k views

Should graduate students be encouraged to participate in MO? If so, at what stage?

When I started graduate school ten (!) years ago, a more senior Ph.D student at the time told me about MathOverflow and encouraged me to participate. Ever since then I have found it immensely useful. ...
3 votes
1 answer
232 views

Should we have standing bounties?

There have been proposals to stop the bounties from expiring. On meta.SE these have been received rather badly, but would be most likely welcome here, as offering rewards for unsolved problems has a ...
1 vote
1 answer
112 views

Updated questions

The following question of mine frequently appears as recently updated question so I frequently find it at front page. But neither me nor other participants did any revise or edit on this post and its ...
31 votes
9 answers
1k views

Privacy of software-generated links to questions and answers

Recently I noticed that the software inserts the id of the currently logged in user in the “share” link of any MathOverflow question or answer. When one is logged out, the “share” link comes out ...
2 votes
1 answer
127 views

What is up with the "Question feed" vs. "Related Questions"?

When looking at a question, for at least the past few months I've noticed an inconsistency in what displays in the righthand sidebar. What I expect to see is a list of "related questions" -- ...
10 votes
1 answer
332 views

How to report intrisically spammy user accounts?

Sometimes, I notice that some very odd username is listed on Home as having earned the "Autobiographer" badge, where by "odd" I mean something very much non-mathematical and ...
-4 votes
2 answers
2k views

Why have I been suspended from the ICM chat? General remarks about unwelcoming behaviour on MathOverflow

Although the below obfuscates the context which is undoubtedly relevant to what has happened, the following comments appeared to be reason enough for the moderators to ban me from the ICM chat. ...
13 votes
1 answer
608 views

Did spacing increase recently?

Yesterday I noticed that line spacing in questions & answers is bigger than before, something like 1.5 Is there some global change, or is it a bug? Or maybe I do have a bug or something? Can I ...
0 votes
0 answers
106 views

Can I delete one of my posts that has been closed as off topic and received an answer with positive up-vote?

Can I delete one of my posts that has been closed as off topic and received an answer with positive up-vote? Should I delete all my posts that has been closed as off topic? (with/out answer)
5 votes
1 answer
252 views

How can this user have a negative year reputation?

How on earth did Noah Schweber (whose contributions to MathOverflow I always greatly enjoy) end up with a negative year reputation for 2020?
10 votes
5 answers
2k views

Questions, answers, comments or discussions on aspects of politics relevant to mathematicians on MathOverflow (main or meta)

Given the recent question here on meta about the deletion of a comment stating a political opinion on an answer which also stated a political opinion which sparked a lively debate, let me bring up the ...
6 votes
1 answer
309 views

Is it reasonable to expect that the number of upvotes is greater than the number of favorites?

Am I mistaken to think that logically the number of upvotes to a question should be greater or equal to the number of favorites? The small difference between these two numbers in this post: Examples ...

15 30 50 per page
1
3 4
5
6 7
34