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I find it strange that recent MO questions in complexity theory are asked by unregistered users using nicknames. The questions don't look like easy undergrad homeworks, but they might be homeworks from a graduate course (they lack any personal motivation, don't seem to be focused, the nickname changes, the questions are stated in a way that feels like a graduate course assignment). It might be nice if moderators can check if they are being posted by the same user.
Kaveh: when I click on your links I get an "untrusted" warning from my browser. My first response was to not open the link but on a closer look it appears to be because you're using https references rather than http ones.
On your actual concern: I've often wondered why people bother posting these types of questions here when the cstheory.stackexchange.com site seems a far better fit.
It does seem very likely that these are all the same user. Some of them come from the same IP (the ones with the same gravatar images), and the others are likely the same person for other reasons (e.g. same writing style, similar names, ...). It isn't our job to keep people from cheating on their homework, so that side of it doesn't bother me. However, it doesn't look like these questions are very good, which is the more annoying thing. What can be done about it?
@Ryan, sorry, I use EFF's HTTPS Everywhere and sometimes forgot that MO's certificate is not valid and I have to fix the URLs (now fixed).
@Will, the questions are not off-topic by themselves (they are NOT typical undergrad level). I probably would not notice it if there were not so many posted recently. On cstheory we have a little bit stricter policy and expect the OP to explain the motivation for the question and what they have done to answer it by themselves (particularly for questions in complexity since it is easy to generate difficult complexity theory questions, e.g. "What is the relation between complexity classes $C$ and $C'$?", "What are the consequences of $C$ being in $C'$?", ...). Probably with a little bit more effort the posted question can be turned into interesting and good questions.
@Anton, maybe we can politely suggest that they register and use real names? Also we can ask them to improve their questions by adding a motivation section explaining why they are interested in these questions and what they have tried to answer them?
@Henry, I agree that they don't look like undergrad homeworks, but I have seen instructors giving these type of questions as assignments in graduate courses. Still I am not sure if that is the case here, your theory is also reasonable. I just posted a comment to the last question linking to this discussion. (side note: I don't think that is true in general, some TCS researchers consider themselves computer scientists, others consider themselves mathematicians, and most consider themselves both.)
I think the user is not using the MO in a nice way and is posting a considerable number of questions that he doesn't seem to care about (they are left unanswered). The posts are not useful for others, e.g. 1 are just left there. Is there something that can done about this?
They could potentially be closed as "no longer relevant".
By and large the only problem abandoned questions cause is that if there's no response with an upvote, it will be recycled to the top of the list every once and a while.
I had a look at the questions you mentioned. Wow! There's a lot of them, and the majority have no responses, and little if any comments of substance. I voted to close as no longer relevant, at least for the ones that garnered no interest at all. If nobody agrees with me then no harm done and my votes will disappear in a few days.
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