# Upper Bound for Difficulty of Questions on Math.SE

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.

• Somewhat related question, on future potential migration of some questions to MathOverflow: meta.math.stackexchange.com/questions/4880/… Dec 18 '12 at 1:23
• There is also an upper bound on MO. MO is not for known open problems. Dec 18 '12 at 8:45
• 9${}{}{}{}{}{}$ Dec 18 '12 at 19:35