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46 votes
2 answers
2k views

arXiv vs MathOverflow - popularity of disciplines

Inspired by the comparison of programming languages by GitHub and Stack Overflow activity (e.g. this one for 2015) I decided to look at the popularity of mathematical disciplines by using data from ...
Piotr Migdal's user avatar
  • 1,592
44 votes
0 answers
1k views

An interactive graph of MathOverflow tags

I created a graph of tags from Stack Exchange sites (including MathOverflow), TagOverflow. It is a continuation on my previous project - plots with static graphs and (sadly) without MO (due to API ...
Piotr Migdal's user avatar
  • 1,592
32 votes
1 answer
608 views

Potential "technical" obstacle to migrations, and suggestion for a solution

Practical advice: If you want to/vote to migrate something to another site (especially math.SE) please make sure that at least one of the tags on the question exists on the target site (math.SE). ...
user avatar
26 votes
28 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 ...
24 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 ...
Joonas Ilmavirta's user avatar
22 votes
5 answers
2k views

What should be the policy on "open problems" on MO?

The subject of this discussion are questions on "open problems" on MO. There is an existing policy on "open problems" reproduced from the (old) FAQs, which involves an open-problem tag. The ...
user avatar
20 votes
0 answers
760 views

Which "non-arxiv" tags are de facto top-level tags?

The tag system on MathOverflow is designed in such way that each question should contain top-level tag; these are the tags which correspond to subject areas on arXiv and generally have format such as ...
Martin Sleziak's user avatar
19 votes
1 answer
628 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 &...
YCor's user avatar
  • 62.2k
18 votes
1 answer
476 views

Is the [completeness] tag necessary?

I have noticed today that we have a completeness tag. It currently houses seven different questions on widely different notions of completeness. Since there are widely different notions of ...
Asaf Karagila's user avatar
  • 38.5k
18 votes
0 answers
527 views

What "lattices" do we need?

The tag lattices is a problem since a long time. Over the years there were varied discussions about this, but no clear resolution emerged, though some things were done to better the situation. This is ...
user avatar
17 votes
24 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!
17 votes
4 answers
955 views

Should we blacklist or delete the "research" tag?

Should we blacklist or delete the research tag? This site is about mathematical research, so I don't see how the "research" tag is helpful, any more than a "mathematics" tag would be helpful. Of the ...
user avatar
17 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://...
17 votes
1 answer
435 views

Noncommutative rings/algebra tags

I'm suggesting to make noncommutative-rings a synonym to noncommutative-algebra, in the same way as commutative-rings has been made to ac.commutative-algebra. Initially asked there, I'm asking it ...
YCor's user avatar
  • 62.2k
17 votes
0 answers
584 views

The existing deprecated tags should be blacklisted

TL;DR: I suggest to blacklist the deprecated tags that still exist on some questions, in order to prevent them from being added to new questions. There are a few tags which are deprecated and should ...
Martin Sleziak's user avatar
16 votes
1 answer
454 views

New bolded tags?

The past few days, I’ve noticed that the question tags on the main site are now bolded; is there any way to revert them back to normal? (Not the end of the world, but I find it distracting more than ...
Alec Rhea's user avatar
  • 9,249
16 votes
4 answers
2k views

Tags that encourage off-topic questions

MathOverflow has a few problematic tags which are not inappropriate by themselves but suggest off-topic ideas. A prime example of this is the calculus tag. Sometimes a research-level mathematics ...
15 votes
1 answer
355 views

Could there be a warning when a new tag is created?

It is rather easy to make a typo and create a new tag by mistake without even noticing it.1 Could we have a warning saying that the user is creating a new tag so that users can notice such mistakes ...
Martin Sleziak's user avatar
14 votes
2 answers
618 views

Recent suggested tag wiki edits

Today [Apr 21 '16] and yesterday there were a considerable number of suggested edits to previously empty tag wikis and tag wiki excerpts (browse here; viewing the full list requires >=10K points, I ...
Stefan Kohl's user avatar
  • 19.5k
14 votes
0 answers
218 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 ...
user avatar
13 votes
2 answers
941 views

Reappearance of (topology) tag

I have noticed that topology tag was created again. According to list of new tags it was created Jun 9 at 7:55. There are currently 3 questions having this tag. I was not able to find a discussion on ...
Martin Sleziak's user avatar
13 votes
2 answers
621 views

What is the intended use of the (proofs) tag?

There is a tag called proofs. This tag has empty tag-info/usage guidance. Without any usage guidance it is quite likely to be used incorrectly. The fact that there are many deleted questions having ...
Martin Sleziak's user avatar
13 votes
2 answers
397 views

The tag (elementary-number-theory) - yes or no?

The tag elementary-number-theory was created and removed a few times in the past. And recently it was created again - it is still listed among the new tags. Should there be a separate tag for ...
Martin Sleziak's user avatar
13 votes
2 answers
372 views

Usefulness of longer tags

This thread is meant as a place to discuss the utility (or lack of it) for longer tags. Currently, tags can have a maximum of 25 ASCII characters. That leads to interesting results such as ...
Ricardo Andrade's user avatar
13 votes
0 answers
352 views

What should the tag (open-problems) be used for?

Since this issue came up in comments to another questions on meta, I'll ask about the intended issue of the open-problems tag. Question. What is the intended usage of the open-problems tag? Should it ...
Martin Sleziak's user avatar
13 votes
0 answers
161 views

Improve management tools of favorite and upvoted questions/answers

Here is my wish list: When one marks a question as favorite or upvotes it, give a chance to: Mark the question with a private tag. Add a private comment to the question. Its length could be limited ...
Adam Przeździecki's user avatar
13 votes
0 answers
433 views

Use of arXiv tags

When MathOverflow began we decided to start using arXiv classification and created corresponding tags. These are still the most broadly used tags on MathOverflow. However, the usage of some these tags ...
François G. Dorais's user avatar
12 votes
4 answers
585 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 ...
François G. Dorais's user avatar
12 votes
1 answer
656 views

Why are MO tags formatted as they are?

I noticed that some of the more frequently used MO tags are formatted according to a certain pattern, e.g.: nt.number-theory pr.probability lo.logic fa.functional-analysis Why are the tags formatted ...
Newb's user avatar
  • 201
12 votes
1 answer
374 views

On convexity tags

The tags on convexity are convex-geometry ($\times$560), convex-analysis ($\times$ 266), convexity ($\times$ 420). Here the number is the current (2019/02/23) number of uses and I ignore some more ...
YCor's user avatar
  • 62.2k
12 votes
1 answer
288 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 ...
Noah Schweber's user avatar
12 votes
0 answers
428 views

Removal of the "symplectic" tag

There is a symplectic tag on MO that currently contains just two questions. The first question so tagged dates from March 26 2017, so this makes this tag at least 1 year and 4 months old. I believe ...
Alex M.'s user avatar
  • 5,347
12 votes
0 answers
252 views

Tag for errata of books

Navigating MO, it is possible to view two kinds of questions regarding errors within a book. The first kind are community-wiki questions which answers are a collaborative listing of found errors in a ...
Tadashi's user avatar
  • 1,590
12 votes
0 answers
193 views

Remove substantial tag score requirement for suggesting tag synonyms?

I have recently attempted to create the obvious tag synonym 'dg-algebras' <--- 'differential-graded-algeb'. However, my attempt was thwarted by the system's insistence that I need five total score (...
Ricardo Andrade's user avatar
11 votes
2 answers
694 views

Streamlined tagging for Mochizuki

For better or worse, there is a number of questions at MO on Mochizuki's stuff. I noticed that some of the questions have the tag "abc-conjecture" while others don't have this tag. Should ...
Mikhail Katz's user avatar
  • 15.7k
11 votes
2 answers
348 views

Merge complex-analysis and cv.complex-variables?

We have distinct tags complex-analysis and cv.complex-variables, of which the latter is the arXiv standard name. They seem to mean the same thing. Should they be merged?
Nate Eldredge's user avatar
11 votes
1 answer
231 views

Who should be allowed to create a new tag?

There is a recent post on MO that includes two new tags: Beer and Bet! The problems of these two tags aside, I don't think it is a good practice to add new tags unless it is absolutely necessary. Is ...
Amir Asghari's user avatar
  • 2,267
11 votes
0 answers
355 views

Role of the tag "gm.general-mathematics"

This question is about the tag gm.general-mathematics. A meta question about it already occurred here, but was less specific (and didn't generate much discussion). See also the discussion in the ...
YCor's user avatar
  • 62.2k
10 votes
2 answers
325 views

What is the tag [derivations] for?

Since the tag derivations has no usage guidance at the moment, I do not know when it should be used, which is unfortunate.
Rodrigo de Azevedo's user avatar
10 votes
0 answers
354 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....
Martin Sleziak's user avatar
9 votes
2 answers
213 views

Should tags be removed from spam?

When flagging spam, I usually delete tags and replace them by tag-removed as well. I just received a comment suggesting that this is not useful. It probably doesn'...
Neil Strickland's user avatar
9 votes
3 answers
490 views

What should we call a tag on point-free topology?

The tag currently used for point-free topology (aka “pointless” topology) is “locales”. I think the name is a bit restrictive: while writing this question (which, indeed, does not contain the word “...
Gro-Tsen's user avatar
  • 30.8k
9 votes
1 answer
318 views

How do I delete an accidentally created tag?

While posting this question, I meant to put the constructive-mathematics tag, but I accidentally just typed "con", thereby creating a "con" tag in MathOverflow. How can I delete it?
Keshav Srinivasan's user avatar
9 votes
1 answer
303 views

Policy for Naming of Tags

I just saw that the Reedy cofibrancy of the bar construction for algebras question is tagged with "simplicial-stuff" and I wonder if such "sloppy" tag-naming is considered acceptable/appropriate. ...
Manfred Weis's user avatar
  • 12.8k
9 votes
1 answer
450 views

On the tag [bitcoins]

Since several questions under the tag bitcoins have nothing to do with Bitcoin per se, but, rather, are related to proof of work, why not rename the tag cryptocurrencies or proof-of-work?
Rodrigo de Azevedo's user avatar
9 votes
1 answer
240 views

New tag for Discrete Morse Theory?

Would it be worth making a new tag discrete-morse-theory? While certainly related to classical Morse theory (which already has a tag), most of the technical tools of DMT are quite different, and the ...
Peter LeFanu Lumsdaine's user avatar
9 votes
0 answers
289 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 ...
Thomas Kojar's user avatar
  • 4,539
9 votes
0 answers
310 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 ...
Martin Sleziak's user avatar
9 votes
0 answers
352 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 ...
J. van Dobben de Bruyn's user avatar
9 votes
0 answers
77 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 ...
François G. Dorais's user avatar