I think that questions on mathoverflow are in most cases on topic here. Does it make sense to have the question on both sites, with a complete answer on mathoverflow and here it appears as unanswered?

A similar question was raised here a few years ago. I think the subject has changed a little since then as now MO is part of the SE network.

What do you think? I think closing as off topic (although not totally true) is the easiest way to get the question from the unanswered queue. Of course another possibility would be to copy the MO answer here with a reference. This is the way some of us have done it before to mark the question as unanswered.

  • $\begingroup$ I think it depends on the question. I'm not sure that "off topic" is correct. In either case, this may give me the incentive I need to figure out what sort of answer I was looking for on some of my cross-posts. $\endgroup$
    – Asaf Karagila Mod
    Jun 25, 2013 at 11:16
  • $\begingroup$ @AsafKaragila For a particular example, see e.g. this question $\endgroup$ Jun 25, 2013 at 11:20
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    $\begingroup$ MO's and MSE's audiences are very different. Something that might be regarded as a good answer on MO, might not be so on MSE. This is of particular importance if we remember that answers are not for the OP only. $\endgroup$
    – Git Gud
    Jun 25, 2013 at 20:59
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    $\begingroup$ @GitGud Good point, although one could argue about the "very", there is quite some overlap. $\endgroup$ Jun 25, 2013 at 21:03
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    $\begingroup$ I would much rather leave a question unanswered than make the ridiculous assertion that a question answered on MO is off-topic. Asaf has the right idea. $\endgroup$ Jun 28, 2013 at 20:21
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    $\begingroup$ @Brian: That last sentence is axiomatically true... ;-) $\endgroup$
    – Asaf Karagila Mod
    Jul 1, 2013 at 15:33
  • $\begingroup$ @Asaf: But I'm not sure I'm comfortable taking that as an axiom. $\endgroup$ Jul 6, 2013 at 16:07
  • $\begingroup$ @Cameron: If you like, I could force this over you... :-) $\endgroup$
    – Asaf Karagila Mod
    Jul 6, 2013 at 16:27

2 Answers 2


I feel that the best path is to mimic comment answers:

Notify, if possible, to the MO answerer about the MSE copy; or post a CW answer with a link to the MO answer and a short notice saying that the answer was given (and accepted, if applicable) on mathoverflow.


Since MO is part of the SE2.0 network now, a mod could migrate the question to MO and a MO mod could then dupe-close (or merge, if adequate) it there.


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