I know that there has been previous discussion about the inappropriateness of certain questions for mathoverflow.net, such as questions pertaining to elementary notions of compactness or differentiability. So, in a sense, there is an established lower bound for the difficulty of questions for mathoverflow.net, but is there an established upper bound for the difficulty of questions for math.se? Certainly, this is de facto the case, but is there a level of question which would be inappropriate for math.se based on the high level of difficulty or sophistication of the question? If there is not, should there be? It seems that it would be detrimental for certain high level problems to be posted on the site, and certainly not beneficial to the majority of users of math.se.

  • $\begingroup$ Somewhat related question, on future potential migration of some questions to MathOverflow: meta.math.stackexchange.com/questions/4880/… $\endgroup$ Dec 18, 2012 at 1:23
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    $\begingroup$ There is also an upper bound on MO. MO is not for known open problems. $\endgroup$ Dec 18, 2012 at 8:45
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    $\begingroup$ 9${}{}{}{}{}{}$ $\endgroup$
    – GeoffDS
    Dec 18, 2012 at 19:35

1 Answer 1


All mathematics problems are welcome here. There is no upper or lower bound for what level question may be asked, and I do not see why more advanced mathematics would be "detrimental" to the majority of users.

In some cases, after receiving no answers, some users have then posted their question on math overflow. In some rare cases where a questions was posted on both sites, the answer has actually appeared on math stack exchange rather than overflow.

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    $\begingroup$ Let me add a small comment to this: we do not discourage hard problems from being posted here. But we recognize that for questions related to current research, it is likely you will get quicker and more complete answers over at MathOverflow. And it is not just research mathematics. In the FAQ we describe several cases where your questions would be on topic here but may still receive faster and better responses elsewhere. $\endgroup$ Dec 18, 2012 at 9:18
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    $\begingroup$ Also "better response" is subjective here. It is possible that the same question would get a better answer for that asker here or at MO for different askers. $\endgroup$ Dec 18, 2012 at 12:24
  • $\begingroup$ "All mathematics problems are welcome here." From my experience, I really doubt that. $\endgroup$
    – Galen
    Apr 20, 2020 at 1:12

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