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Is it appropriate to post question asking to prove NP-completness of more than one problem?

I believe that I discovered a method to generate several NP-complete problems. The NP-completeness proof is not immediately apparent to me. I did not find any reference in complexity literature to my ...
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10 votes
0 answers
950 views

Extending questions and answers gradually

If someone answers my question and I want to generalize it, how should I do it? Is it ok to gradually extend my question as answers improve? An answer to a question I wanted to ask may show me that I ...
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10 votes
0 answers
452 views

searching mathematical formulae like in Zentralblatt Math

It would be nice if searching mathematical formulae like Zentralblatt Math http://zbmath.org/formulae/ could be implemented.
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10 votes
0 answers
173 views

Enabling MathJax over https

MathOverflow (and indeed all the StackExchange sites) support https connections. However MathJax is currently broken, because the default server for the MathJax distribution doesn't support https. ...
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10 votes
0 answers
259 views

When reviewing suggested edits, cancel rejection and approval votes

I have seen many edit suggestions approved which I consider to be minor edits to old posts (which bump them to the front page), or to actually reduce the quality or readability of the post. Other ...
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10 votes
0 answers
184 views

Wrong message for closing questions as off-topic

I was just reviewing the queue for closing votes, and I noticed that the message displayed in the options for closing as off-topic was: off-topic because... This question does not appear to be ...
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10 votes
0 answers
238 views

Where is the off switch for the concurrent preview now?

I feel like an idiot but I cannot find it. Meanwhile, if the post is long and has a lot of LaTeX formulae in it, and the connection is imperfect, the wysiwyg regime is a non-stop fight. I figured out ...
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10 votes
0 answers
586 views

On "How does the work of a pure mathematician impact society?"

The question How does the work of a pure mathematician impact society? was originally quickly closed, relatively quickly reopened, after a longer time closed again and has at the time of this edit a ...
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9 votes
0 answers
298 views

Why are there two separate tags (open-problem) and (open-problems)?

I assume that most likely this was just an oversight - but since it was a result of a moderator's action, it is probably better to ask than just remove the tag singlehandedly.1 Question: At the moment ...
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9 votes
0 answers
518 views

Rationale for reputation change on "my" reputation page that says 'User was removed'

At MathOverflow > Help center > Reputation & Moderation I see the following: [...] a user who voted for one of your posts had their account deleted (either by request or due to violating ...
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9 votes
0 answers
78 views

Feature request: question title should appear above question preview

Just a minor niggle - when I'm reviewing my question, one of the things I want to review is the title. It would be nice if the title appeared just above the preview of my question, so I could review ...
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  • 325
9 votes
0 answers
314 views

What to do with the synonyms for the deprecated tags?

Recently, the following tag synonyms were created by a MathOveflow moderator: abstract-algebra $\to$ ra.rings-and-algebras, geometry $\to$ mg.metric-geometry and discrete-mathematics $\to$ co....
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9 votes
0 answers
345 views

Suggested tag: approximation-property

I'm relatively new to MO (but have been on MSE for a longer time), which means that I don't have enough reputation to create new tags. Which is probably a good thing. Lately I've been puzzling with ...
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9 votes
0 answers
281 views

Mathjax CDN is shutting down effective April 30th 2017

If you haven't seen the official announcement yet, Mathjax is shutting down their CDN effective April 30th 2017. We are currently looking for alternatives for hosting this service including self ...
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9 votes
0 answers
236 views

Should delete votes add a post to the low quality posts review queue?

Presently, unlike "Very Low Quality" flags, delete votes do not add a post to the "Low Quality Posts" review queue. -- Should they?
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9 votes
0 answers
820 views

Probable Homework

This post asks for the solution of a problem subject to various artificial constraints of the sort that frequently arise in homework problems. When asked repeatedly why he wants to impose these ...
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9 votes
0 answers
276 views

Is this question appropriate for MO? (Instability of Newton basins of polynomials at multiple roots)

About a year ago I asked on MO when a Newton basin fractal is continuously determined by the roots of its polynomial. I mentioned in that question that I had convinced myself that the roots of the ...
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9 votes
0 answers
459 views

Questions on Mathematical Writing

Where should I ask about how to approach Mathematical paper writing? For example, the question [How to write an abstract for a math paper? ] was put on hold? Which stack exchange site should I have ...
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9 votes
0 answers
494 views

Suitability about a question on amenability of Thompsons group $F$

I was wondering if a question along the lines of the following would be appropriate for MO: An open problem that seems to get a lot of attention every once in a while is the amenability of ...
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9 votes
0 answers
693 views

Why this is off-topic?

I posted a question on MSE for two months and received no helpful answer. So I tried the same question on MO. I got 4 off-topic votes and so the question got migrated back to MSE. I'd like to mention ...
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  • 163
9 votes
0 answers
626 views

Why was the question about "expected difference of random variables" put on hold?

As I explained in the answer to the question The metric of the expected difference of random variables, I don't see any reason for closing it other than simple misunderstanding (to put it mildly) on ...
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  • 15.5k
9 votes
0 answers
593 views

The Math Teaching Stackexchange proposal is registering 38 more users for a private beta

Edit: Thanks to everyone who has signed up. There are already 162 participants, a number which usually takes several months to acheive. As mentioned in this post, there is a proposal on Area51 for a ...
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9 votes
0 answers
68 views

Tag suggestions on ask page

The ask page tag input box currently looks like this: The old ask page on MO 1.0 had a much more detailed description of what top-level tags on MO are: Since appropriate tagging on MO can be ...
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9 votes
0 answers
478 views

Is this question appropriate? (Counterexamples in Universal Algebra)

I have a question which I'd like to ask, but I'm not sure it's appropriate for MO, and I wanted to get some feedback. The reasons I'm worried it might be inappropriate are: (1) there are already ...
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9 votes
0 answers
630 views

Collatz Question

I voted to close this question about a "5n+1" version of the Collatz conjecture because it appears to be entirely unmotivated, with no heuristics and not even any substantial numerical evidence. I ...
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9 votes
0 answers
288 views

Users with multiple accounts

In the old meta we had a very useful thread where one could point to moderators multiple accounts to be merged. Since things have changed, would there be a point on having such a thread here, or what ...
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9 votes
1 answer
311 views

Remove the user-identifying part of the "share" URL

When you click the 'share' button beneath a post on MathOverflow, a box pops up containing a short URL for the post, e.g. of the form ...
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8 votes
0 answers
96 views

Some but not all LaTeX rendering correctly on tools page

Users with sufficiently high reputation have access to a "tools" page, which I like a lot. However, sometimes I find that the $\rm\TeX$ doesn't render properly. What is particularly puzzling ...
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  • 64.1k
8 votes
0 answers
563 views

What happened to the fonts?

It appears that MO (including MO Meta) has recently changed the display fonts: I couldn't find any topics on MO Meta pertaining to this new change, hence this question. SO has also switched the fonts,...
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  • 5,661
8 votes
0 answers
840 views

2021 Community Moderator Election

The 2021 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, ...
8 votes
0 answers
547 views

Is there such thing as "typical user reputation curve"?

This question is driven by sheer curiosity - maybe even vanity? My reputation curve acquired curious shape lately: I can even guess reasons (mostly personal) why the pace is so slow ever after June ...
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8 votes
0 answers
178 views

Icon for citation helper

On the main MathOverflow site (and also on math.stackexchange) the icon for the citation helper, which used to look as below, has recently confusingly changed to a "B", identical to the icon at the ...
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8 votes
0 answers
369 views

MathOverflow in the news

What are some instances of MathOverflow being mentioned in the media? Now that MathOverflow has recently had its tenth anniversary, I would be interested to learn of any mentions of it in the mass ...
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8 votes
0 answers
231 views

Using MO in China

I am on a business trip in Beijing and get the following error message when using MO: Question: can that somehow be fixed?
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8 votes
0 answers
738 views

Between math stack exchange and mathoverflow

Suppose that I posted a question on mathstack exchange and no one has answered it. In my opinion it is not enough reason to post it on mathoverflow but if I also awarded a bounty and still didn't get ...
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  • 8,670
8 votes
0 answers
500 views

Downvoting and Closing of a Good Question

This seems to be a perfectly good (i.e. interesting and nontrivial) question that was downvoted and closed for mysterious reasons. As far as I can tell, the main objection is that the author ...
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8 votes
0 answers
232 views

Can we bring back the question about Gauss-Legendre nodes and weights?

The question Computing Gauss Legendre Quadrature for Large N was voluntarily removed by its author, after I implied (with a link to Wikipedia) that the answer was trivial and well-known. I have ...
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8 votes
0 answers
147 views

TeX sometimes displays incorrectly on search pages

When I type a search into the search box, sometimes the list of questions returned contains incorrectly handled TeX (of the sort that once was common all over the place here). Here is an example: ...
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  • 25.7k
8 votes
0 answers
556 views

How does MathOverflow deal with the liability for the content of the site?

As can for example be read here and here, creators or webmasters of websites are responsible for the content of their website, even if the material leading to legal issues (for example disputes ...
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  • 408
8 votes
0 answers
315 views

Asking two questions, one of which implies the other

I have two statements, A and B, and I want to ask on MO whether they are true. They are not obviously related, but I have a (simple) argument to show that A implies B. Should I: Ask about both in ...
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8 votes
0 answers
124 views

Automatically fix outstanding mathjax issue involving backticks

After the transition to the stack exchange network, I have occasionally noticed posts being edited to replace occurrences of the following code (note the backticks): ...
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8 votes
0 answers
152 views

Appropriate procedure for removing little used tags which are too specific

What is the correct procedure for removing tags which only have a single question, and would be better off with a less specific tag? My example is a question which was tagged 'relative-entropy'. ...
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8 votes
1 answer
260 views

Tag for Fragments of Peano Arithmetic

There are quite a few questions on the main site related to (first-order) Peano Arithmetic and its fragments. Here are two examples: 1, 2 (but there are many others). It would be nice, and feels ...
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7 votes
0 answers
157 views

Diamond moderator symbols and old posts

This question, or rather, (vague) feature-request is not specific to MO; however I leave it to more experienced (and with better skill in writing English) users to possibly ask it elsewhere. ...
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  • 51.2k
7 votes
0 answers
270 views

`positive-characteristic` and `characteristic-p` are synonyms

I thought that tag synonyms were meant simply to be proposed and left to survive or die on their own, but I see another question in HNQ about tag synonyms, so maybe one is supposed to raise a ...
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  • 7,373
7 votes
0 answers
297 views

2020: a year in moderation

As we say goodbye to the old year and welcome the new one, we have a tradition of sharing moderation stats for the past 12 months. As most of you here are aware, sites on the Stack Exchange network ...
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  • 101
7 votes
0 answers
483 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 ...
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  • 21.2k
7 votes
0 answers
348 views

Misspelling of Cauchy-Schwarz

As a comment of Dennis Serre, the correct spelling of Cauchy-Schwarz is Cauchy-Schwarz (not Cauchy-Schwartz): The spelling is Cauchy-Schwarz, from Hermann Schwarz. If you are interested in Fourier ...
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  • 1,961
7 votes
0 answers
133 views

Two copies of a question

There are two cases in the last hour of questions which have appeared twice, with both copies appearing pretty much simultaneously: 313547 = 313548 313550 = 313551 Coincidence or bug? EDIT: I ...
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7 votes
0 answers
229 views

Editing an old post to add MathJax

Sometimes I come across an old post which does not use MathJax. Is it OK to edit such a post if the edit improves readability? This question (and its answers) motivated this post. I know some users ...
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