TITLE: Is "P vs NP" problem solved?
QUESTION [6 upvotes]: Many people have tried to solve the very famous problem "P vs NP" and a lot of solutions are proposed. (e.g. A. D. Plotnikov, On the Relationship between Classes P and NP). But I couldn't find any reputable place to find out if these solutions are right or not, and if not why not?
How can I know the answer? Is the problem solved? By whom? how?
Thanks in advance.
p.s. A set of possible solutions could be found at http://www.win.tue.nl/~gwoegi/P-versus-NP.htm but I couldn't find out if they are correct or not.

REPLY [16 votes]: It is currently unknown whether $P = NP$.  All purported proofs have either

been shown to be faulty, 
are under review, or
are dismissed by the community at large without being considered.

For more information on the last one, you might want to read Scott Aaronson's blog post detailing indicators why a purported proof is likely to be wrong and won't receive much attention.
Hope this helps!