What is the Math.SE take on questions like http://math.stackexchange.com/questions/1064/perfect-set-without-rationals, whose answer, judging from the comment, is known to the OP?

See also: meta.math.stackexchange.com/questions/241/… Note that it's explicitly-allowed practice on SO (per the FAQ) to answer your own question (pretty sure you don't get +15 rep for selecting it as the answer, though). – Isaac Jul 28 '10 at 21:46
The asker knowing the answer is not the problem I have with this question. I downvoted it because it looks like the asker copied it from a homework assignment or test without putting any thought into it. – Larry Wang Jul 28 '10 at 22:16

I think maybe this question is a "seed" question. See OP's profile:

I am a Mathoverflow user who wants to enable this site to have high quality, as opposed to being too sloppy a site. So I am seeding the site with good quality questions that are suitable for all college students; but won't be accepted in MathOverflow. I also want this site to be a home to sensible questions that are brutally closed by the question-closers in MathOverflow.

It seems likely that it is a seed question, yes. Two points: 1) As the site moves further into public beta, I hope "the need for seed" will decrease to zero in finite time. 2) A question that looks like a homework question may not be such a great question to seed the site with, as the present instance seems to show. – Pete L. Clark Jul 29 '10 at 0:13

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