# Unsolved Problem asked as a question in math.se

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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That is one reason I go about asking people posting number-theory related questions for the source of the problem... –  Aryabhata Mar 25 '12 at 19:57
There also is the open-problem tag. –  Martin Sleziak Mar 26 '12 at 14:16

@RahulNarain: Let $\alpha<\omega_1$ can we find a question which is $\Sigma^0_\alpha$ but not $\Sigma^0_\beta$ for all $\beta<\alpha$? –  Asaf Karagila Mar 26 '12 at 10:32