What are the guidelines? Will the moderators take action OR does someone have to flag it as "Known Unsolved Problem" or "Known Open Problem".
For instance question here was about a Diophantine Equation that is listed as Unsolved.
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3$\begingroup$ That is one reason I go about asking people posting number-theory related questions for the source of the problem... $\endgroup$ – Aryabhata Mar 25 '12 at 19:57
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2$\begingroup$ There also is the open-problem tag. $\endgroup$ – Martin Sleziak Mar 26 '12 at 14:16
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I think that an answer explaining that this is an open problem and perhaps listing a few sources for that (and maybe conjectures on the possible answers) should be a good step, no need to alert the moderators.
answered Mar 25 '12 at 13:10
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3$\begingroup$ I wonder if we're talking about a situation where OP knows it's a known unsolved problem and withholds that information. I could see where the moderators might want to know about such behavior. $\endgroup$ – Gerry Myerson Mar 26 '12 at 0:58
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5$\begingroup$ @Gerry: yes, and it would be ironic if we can get a new closure reason "closed as 'known open problem'". $\endgroup$ – Willie Wong Mar 26 '12 at 8:15
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9$\begingroup$ I can imagine the topologists saying, "Sure, a question can be simultaneously open and closed, what's the problem?" $\endgroup$ – user856 Mar 26 '12 at 10:23
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$\begingroup$ @RahulNarain: Let $\alpha<\omega_1$ can we find a question which is $\Sigma^0_\alpha$ but not $\Sigma^0_\beta$ for all $\beta<\alpha$? $\endgroup$ – Asaf Karagila♦ Mar 26 '12 at 10:32
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$\begingroup$ @RahulNarain Your last comment was hilarious, even if it is incorrect. :-) $\endgroup$ – Comic Book Guy Apr 2 '12 at 8:20
