# Tag Info

43

Sometimes you want to have pizza for dinner. And that's fine. You call the local pizza place, and you order pizza which is delivered to your house usually within 30 minutes. What you don't do is neither call several pizza places and see which one gets first to your place; or call a falafel place, and order a large pizza with extra mushrooms. When do you ...

35

My personal opinion is that cross-posting is okay as long as each question links to all other versions of itself. Otherwise you risk unnecessary duplication of effort (someone slaves over a hot stove to bring you an answer on one site only to find that someone else has already written the same stuff on another site), which I think is mildly disrespectful to ...

28

Short answer : no. (By the way, it has never been "okay" to simultaneously cross-post questions on MSE and MO. We've been requesting users to stick with one site and wait for a reasonable amount of time before trying to ask on the other site.) Longer answer: As of today, a question that you may want to move between the two fora now can be properly ...

28

I would recommend that you answer the question yourself, mostly because it would otherwise go on the Unanswered Questions queue for a silly reason. But also, answers from MathOverflow are not always appropriate for the audience of MathSE. Writing up a version of the answer there that is adapted to the MathSE audience does add value to this site. So adding ...

22

Cross-posting the same question to multiple sites is generally frowned upon across the network; see this Meta Stack Exchange question. Jeff Atwood's own answer to that question is perhaps interesting to read as he is one of the founders of this network. Here is a partial quote. There are some questions which fall into grey areas between sites, and I think ...

12

In addition to the point made by Qiaochu Yuan about wasted effort on duplicate answers, crossposting without crosslinking also does a disservice to anyone else who may later have the same problem and tries to search for it, since the answers will be scattered across multiple sites. In order to make them easier to find, I have edited the three questions you ...

11

Thanks to the helpful links posted in the comments by Martin Sleziak, I obtained a precise answer to the question here. The answer, on MO Meta, was to a question about cross-posting in the opposite direction, but it explicitly dealt with both directions. The answer, which was the sole answer to the question and by a high-rep poster, was well upvoted and ...

8

Moderators on the site your question is currently on have the power to migrate it to any other site in the SE network. Flag your post for moderator attention and fill the "other" textbox in with a short case for moving it to (site of your choice). If it's clear even at a short glance that your question falls within the scope of the target site, the "short ...

8

Such a question would be on-topic here. However, another SE site Computational Science has a higher concentration of people working on cross-disciplinary problems between mathematics and programming. Consider whether your question would be a better fit there.

8

Often it is in the user's interest not to migrate the post. A migration does not help them that much, it is easy enough to copy over the post. However, there are at least two drawbacks of a migration: Migrated posts keep their original "created" time stamp. Thus, a migrated post will not appear on the top of the "new" queue. It will have less visibility ...

6

Is it at all reasonable to just point out that we are aware of MO existence on the help/faq page and say that if you cross-post to MO to link to it and reference it? It is certainly reasonable. But do keep in mind that this will be much more easily sorted out in the future: MathOverflow 2.0 is a-comin'! What, when and will we migrate questions to MO 2....

5

Two points, neither of which address your question directly, but need to be thought about Moderator supported is not synonymous with official. In fact, a better (albeit still not perfect) descriptor of "official" on the Stack network is "current community consensus". Irony aside, this very question should be either cross posted to Stat/CV, or perhaps asked ...

5

The "DIY method" you refer to is called "cross-posting", proper migration would generally include deleting the local copy. Cross-posting between sites—especially sites with a large intersection of population, like Math.SE and MathOverflow—is highly discouraged as it leads to duplication of efforts, and often a situation where one could spend a ...

5

Only an employee would be able migrate the question, and it is highly doubtful that they would do so in this instance. (In addition to being old, it's not actually off-topic here, and one of the criteria for migration is generally that it is off-topic on the original site.) What I would recommend doing is first determine which parts of your question have ...

4

Given that everything is connected and there's no good line to draw separating CS from mathematics, I think the only really satisfactory solution is if the SE software acquires support for actual crossposting, where the same question and all its answers can be visible on the two sites simultaneously.

3

Outcome: the question was cross-posted, migrated, closed as duplicate and answered on stats.SE. (Should have been simply migrated.)

2

Here is my suggestion: cross-posting an on-topic question is fine as long as: it is not simultaneous, and the OP has waited a reasonable time (a few days) without receiving a satisfying answer before posting it on another site, and the OP has provided links in both directions between the copies. The OP should keep all copies up-to-date (e.g. if one copy ...

2

In my opinion, it's not a good idea to compare questions at MSE/MO with pizza/falafel orders. The qualitative difference is that when you "call the local pizza place" you have immediate feedback, and you can specify details: you usually ask people there, if they indeed can make what you want (sometimes this is impossible, say because they do not work today), ...

2

Math Overflow is for research-level mathematics (research-level means research done by professional mathematicians). If your question fits this description then you should post it at Math Overflow (because it is likely the few people here would be able to answer). If your question does not fit this description then even if you waited for 1000 years and no ...

2

I've looked at the Question at issue, and I think it not in good shape for Math.SE or MathOverflow. It asks about "how many" functions of three variables cannot be expressed as a composition of two bivariate functions in a particularly constrained way, namely that $T(x,y,z)$ cannot be expressed as either of these forms:  f(x,g(y,z)) \;\text{ or }\; f(g(x,...

1

From the perspective of an active HSM user: Some parts of the question would be perfect for HSM: I also want to study the historical perspective of this term and want to know how and why it has two different definitions. That's great for HSM. Another part is sort of on-the-fence: I want some references related to this term. This could be on topic if ...

1

I have always wondered if MSE and MO are that different when it comes to research-level questions: As I take it a true "research" question would require research to answer. - Why would somebody do that research for me and post it online instead of publishing a paper herself? The better term would be "research-related". I am looking for information that is ...

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