21 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. ...
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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.
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  • 11.8k
17 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 ...
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  • 49.6k
12 votes

the correct way to "cross-post"?

You can flag the post for moderator attention on MSE, choose the free-form flag and ask for a migration to MO. Another option, which is useful when the crickets really chirp, and you haven't got any ...
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  • 35.4k
11 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 ...
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10 votes

Migrating a manifold learning question from CS theory to MO overflow

I would have nothing against such a question on MO. My guess is that it would be well received here. But I'm not a specialist in the topic, so you should not go by my word only. If you migrate it ...
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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 ...
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  • 35.4k
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 ...
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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 ...
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3 votes

Well-received but unanswered Math SE question; should I consider posting it here or requesting migration?

Gathering comments together into an answer -- There's no problem cross-posting a research-level question from MSE to MO after enough time has passed to give potential answerers a chance to post ...
2 votes
Accepted

When and how to post a question on scicomp.stackexchange.com

I would like to second @quid's comment, especially the latter half: Although there is some overlap between the communities, the scope of scicomp and MO is sufficiently different that it makes sense to ...
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