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StackExchange sites work on the basis of community moderation: as a user gains reputation through upvoted questions and answers, moderation powers increase: https://mathoverflow.net/help/privileges. What has happened is that five users who have earned more than 3000 points of reputation have voted to put the question on hold. As noted by angussidney above, ...


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I vote to close when it's clearly homework. I vote to close when the question is severely ill-posed. I also tend to vote to close (more precisely to move to math.SE) when the problem could be given as an exercise in a common course up to beginning graduate level. I emphasize "common" because, unlike core subjects like basic analysis, algebra, differential ...


15

Closing a question prevents new answers to be added. If one could close a question with a bounty, the net effect would be to shorten the bounty period, possibly causing the loss or misattribution of bounty points. On the other hand, adding a bounty to a question can be used to prevent closing a question, which is a misuse of the bounty system. Since there ...


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It's certainly true in "MO culture" that users who choose to answer a question that others feel is clearly inappropriate are often criticized for doing so, typically with a comment which says something like, "Please do not answer questions that do not belong on MO; it will only encourage the asking of more such questions." Such an answer is also often ...


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Like the other answers, I vote to close questions that are obviously off topic (e.g. spam), or seem like homework, or seem better suited for MSE or Stats or CS sites. In deciding whether to close or not, I use a very high tolerance level for subjects not close to me (and avoid altogether some areas like geometry/topology, logic etc), and with a somewhat ...


12

Yes, one should be closed as off-topic, and migrated to the other site, where it can be closed as a duplicate. It's a bit painful that we can't close as a duplicate of a question on another site, but that's the present state of things. I think the majority of cross-posted questions will be off-topic for MO and on-topic on MSE, but not all. I see you're not ...


11

I vote to close questions that are clearly at the level of exercises in a first-year graduate course or lower; this requires me to be familiar enough with the subject matter. When a question looks like it might be an exercise but it's in an area I don't know well (so I'm not certain), then I will not vote to close even when there are already some recorded ...


9

A research-level question can also be off-topic if the community has chosen to restrict the scope of the site so. Our help pages state that questions about open problems are off-topic, so closing because of that is fine. The standard off-topic closure reason is misleading, so I suggest you vote to close under a custom reason. Choose the option "Other" under "...


9

Yes, close- / reopen votes do expire after some time. -- To cite the help center: Close votes age away harmlessly after 4 days if the threshold is not reached. Each new close vote resets the timer, and close votes only start expiring if the question has had 100 views.


7

Me being the "high rep user", I might as well give my reasons for the comment. Firstly, I would say if one thinks that the question is inappropriate, then one shouldn't answer it, regardless of the circumstances. In the situation that Emil hypothesises about, one can leave a comment under the misleading answer. In the situation at hand, if the OP receives ...


7

It's generally a complete disaster when someone asks a question, has it answered via an trivial comment, and then changes the question to the question 'they really wanted to ask'. To anyone coming along later, it's near impossible to understand what's going on. It's nearly always best, if your initial question turns out to be broken in some way, to say ...


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I remember doing this once. There was some combination of factors that made it make sense to do so at the time. All I did was to check my answer as Community Wiki. I won't say that addresses all the concerns in the two other answers here, but at least it meant that I was not taking points for a crap question. I think I was the first vote to close, and the ...


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The suggestion in this post is only about cross-posts, by which I mean that a user posts the same question at the same time on both sites.1 But very probably this is the same thing what the OP meant by cross-post. If the questions is left on both sites and it is, for example, closed on MO and answered on MSE, MO will be left with the closed question. If the ...


4

I didn't vote to close, and wouldn't have. But the premise seemed off base to me. Here is a purely personal reaction which might say more about me than anything else but might also explain why some people did vote to close. 1) I find the phrase "Mathematical Intuition Pumps" in the title off-base. 2) The question starts out with the claim: Experts have a ...


3

Sometimes questions do not fit the forum. When I comment on these questions, I normally suggest they picked the wrong forum, and sometimes suggest a different forum. If there is an obvious fix that would make the question better, I suggest that. On a recent number theory example I suggested the poster do more research and not expect the community to do it ...


1

This is very much dependent on the question and the poster. There are some questions which look like high school homework problems posted by users who are new to the forum. These are usually quickly dispatched, although a leading question in a comment may be a public (dis-)service. There are some questions which look like homework or show a serious lack ...


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