59
votes

### Welcoming new user: on a recent question about connections

I just want to comment, I think at this point, fighting and unpleasantness about whether questions are appropriate is a much bigger problem for the site than the presence of less-advanced questions on ...

Ben WebsterMod

- 42k

53
votes

### A StackExchange website aimed at graduate students?

I believe it is impossible in general to distinguish questions asked by a graduate student and those asked by a mathematician in a domain in which they are not specialist. Since the latter are ...

- 24.1k

47
votes

Accepted

### Why is "what is the difference between mathoverflow and math.stackexchange?" not prominently displayed?

I think you ask a quite reasonable question. One certainly could have a more condensed
description of what is on-topic on MathOverflow, and put this in a prominent place where people see it before ...

Stefan KohlMod

- 18.4k

35
votes

### Welcoming new user: on a recent question about connections

I want to distinguish two different things that were said in the first comment: that the question was not research level and that the question should be migrated to math stackexchange.
It is not ...

- 122k

22
votes

Accepted

### Cross posts to Math SE

If you have posted a question at MSE and want to cross-post it at MO or the other way around, you can do it under the following conditions:
Wait several days, not just hours. I would suggest a week.
...

- 7,663

20
votes

### Interesting (and not sufficiently answered) questions on math.SE

Can someone figure out what is going on in this question about representation varieties of associative algebras? It looks like the OP may have found an error in a published article of Smalø, but I can'...

- 142k

19
votes

Accepted

### Can I ask a question on MathOverflow and also on another site?

Cross-posting is discouraged in general, because it can lead to duplication of effort by people answering on different sites. However, it is appropriate under some circumstances.
Most of the advice ...

Tim CampionMod

- 52.8k

18
votes

### Interesting (and not sufficiently answered) questions on math.SE

Okay, here's one that I think is interesting and has remained unanswered for over a month. (It might also test out this system.)
Does there exist a bijection of $\mathbb{R}^n$ with itself such that ...

- 676

18
votes

### If I can't get an answer on math.stackexchange.com or dsp.stackexchange.com, when should I post here?

Waiting a week would usually be considered reasonable.

- 11.8k

18
votes

### Welcoming new user: on a recent question about connections

I note that frequently users complain about unexplained downvotes and anonymous downvotes. Discouraging comments from users who indeed make a comment of this nature ("this is off-topic") ...

- 54k

17
votes

### How can we visually differentiate MathOverflow from MathStackExchange within the constraints of the new design themes?

EDIT: Some more information from Catija: This screen element is not currently customizable, so if we wanted it customized, SE would have to implement a new feature. Here Catija indicates that the ...

Tim CampionMod

- 52.8k

17
votes

### How can we visually differentiate MathOverflow from MathStackExchange within the constraints of the new design themes?

As a data point for our Stack Exchange overlords, I have twice now tried to migrate a question from math.SE to math.SE because I didn't realize it was already there. I'd really like to get a striking ...

- 142k

15
votes

Accepted

### Mathematics and MathOverflow relationship

There is no formal connection. You may often see the same question on both sites because a lot of people cross-post (manually), a practice which is generally frowned upon, especially when the same ...

Todd TrimbleMod

- 51k

14
votes

### A StackExchange website aimed at graduate students?

It is doubtful that SE would allow another "mathematical" mathematics site to open.
In fact some time ago (2012, so even prior to MO's move to the SE network) there was an Area 51 proposal for a "...

- 676

14
votes

### Interesting (and not sufficiently answered) questions on math.SE

This question asks, given a homogenous degree $n$ polynomial map $f: \mathbb{Z}^n \to \mathbb{Z}$, how can we test if it is a norm map from a number field? I know roughly what the answer must be: Over ...

- 142k

13
votes

### Questions seemingly/apparently/ostensibly too elementary for overlfow

The judgment of whether a question is considered on-topic or not for MO is made by individual MO users. If a question is closed but other users disagree with the reasons for closure, the latter may ...

Todd TrimbleMod

- 51k

12
votes

### A StackExchange website aimed at graduate students?

Personal opinion: I think that the current system of having several of separate sites for different math-related topics (apart from MO and MSE, there are also related ones like scientific computing, ...

- 18.2k

12
votes

Accepted

### Type of content to be posted on MO and differences with MathSE

It makes sense to talk about the core communities of each forum, so that it becomes easier to understand the scope and the differences. Not being active on the mathematics forum, I will give my ...

- 12.7k

11
votes

### Interesting (and not sufficiently answered) questions on math.SE

Is there an injective cubic polynomial $\mathbb Z^2\rightarrow\mathbb Z$?
This question asks exactly what its title suggests: is there a polynomial of degree $3$ in $\mathbb Z[x,y]$ whose induced map ...

- 555

11
votes

### Interesting (and not sufficiently answered) questions on math.SE

Does the open mapping theorem imply the Baire category theorem?
The open mapping theorem and the Baire category theorem are both theorems of ZFC, but are independent of ZF. Working in ZF, one can (...

- 28k

10
votes

### Any other site besides mathoverflow and mathematics stackexchange?

The reddit website has several forums dedicated to mathematics.
The main math forum has a large audience but there are several others subs such as /r/learnmath, /r/homeworkhelp, /r/cheatatmathhomework,...

- 17.2k

10
votes

Accepted

### Is my question suitable for MO?

You have the makings of a good question. To make it acceptable, keep it brief, provide links, and do not add much that is not pertinent.
I will use some of my questions as examples of what to avoid....

- 12.7k

9
votes

### Interesting (and not sufficiently answered) questions on math.SE

Here is a question which seems interesting,
What does it take to divide by $2$?
In a nutshell, we know that in $\sf ZF$, assuming classical logic, we can prove that if $A\times\{0,1\}$ and $B\...

- 36k

9
votes

### This MSE question was rejected for a migration on MO. Are you agree with this decision?

My memory of what happened is this: I was pinged to come over to the moderator chat room and was asked if we "wanted" three MSE posts to be migrated. I said I wasn't sure about the post in question, ...

Todd TrimbleMod

- 51k

8
votes

Accepted

### Asking the same (subjective) question on Math.SE and MO

In general, cross-posting is frowned upon. And rightly so, it feels like an unnecessary duplication of effort, especially when the two communities intersect on a non-trivial subset of their users. To ...

- 36k

7
votes

Accepted

### If I can't get an answer on math.stackexchange.com or dsp.stackexchange.com, when should I post here?

The reason to wait a week or so before crossposting is to avoid having someone spend a lot of time trying to answer on one site, without realizing that it's already answered on the other. After a ...

- 28k

7
votes

### How can we visually differentiate MathOverflow from MathStackExchange within the constraints of the new design themes?

I suggest that we leave the job to Stack Exchange's design team. I'm not sure why we are supposed to come up with a solution ourselves; we are not professionals, and surely SE has someone on staff ...

- 18.2k

6
votes

### A StackExchange website aimed at graduate students?

After carefully reading all your thoughts, I conclude that MO is a perfectly acceptable place for graduate students to post well-thought through questions. Yet, many graduate students (and even ...

- 21.1k

6
votes

### Appropriateness of question on delay differential equations

IMO, yes, that's definitely a graduate-level topic, and so appropriate for MO in that respect. (And I say that as a grad student who's studied delay equations a little.)
AFAIK, cross-posting should ...

- 1,144

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