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I found a paper on arXiv.com that claims that P=NP is proved. The paper is written by a professor in Russia and it looks well-writen. http://arxiv.org/pdf/1208.0954v31.pdf

Can I ask whether or not the paper is correct on Mathoverflow.net?

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    $\begingroup$ That would be too general and controversial. You might me able to ask a very specific focused question about a particular point in the proof if you can motivate it and put into context. $\endgroup$ – András Bátkai Dec 14 '13 at 14:29
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    $\begingroup$ I agree for the general considerations with existing replies. For this particular paper: it is now at 30+ version on arXiv carried out over a year. This is a huge warning sign. $\endgroup$ – user9072 Dec 14 '13 at 15:09
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    $\begingroup$ The abstract link is here: arxiv.org/abs/1208.0954 . Please do not link directly to PDFs on arXiv. Clicking on the PDF link from the abstract page is trivial, whereas no link goes in the opposite direction, and one has to meddle with the URL manually. $\endgroup$ – Emil Jeřábek Dec 14 '13 at 15:52
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    $\begingroup$ @Emil, to go the opposite direction click on the arXiv stamp on the left margin. $\endgroup$ – Anton Klyachko Dec 14 '13 at 18:36
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    $\begingroup$ @AntonKlyachko true, still it can be desirable (say on some mobile device), not having to open a pdf to find out which article is meant. $\endgroup$ – user9072 Dec 14 '13 at 22:50
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    $\begingroup$ Is it possible we could work out a scheme to discourage people from downvoting a question to indicate disagreement? I don't want to discourage people from checking on meta first! $\endgroup$ – Scott Morrison Dec 14 '13 at 22:55
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    $\begingroup$ @Scott Morrison This could worth a question on its own. $\endgroup$ – Daniel Soltész Dec 15 '13 at 11:43
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    $\begingroup$ @ScottMorrison: Indeed, the question is definitely (in the context of meta) "useful and clear". $\endgroup$ – Mark Meckes Dec 15 '13 at 11:55
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    $\begingroup$ Just posted meta.mathoverflow.net/questions/1269/… $\endgroup$ – Scott Morrison Dec 15 '13 at 23:50
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Questions asking for the correctness of certain papers are generally off-topic on MathOverflow. Concerning the particular problem whether P=NP or not, there have been a lot of claimed proofs or disproofs, as well as claimed proofs that the question is undecidable -- see e.g. http://www.win.tue.nl/~gwoegi/P-versus-NP.htm.

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    $\begingroup$ The paper in question is entry 95 on the list there. $\endgroup$ – user9072 Dec 14 '13 at 16:52

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