Math problems

http://www.businessinsider.com/the-most-controversial-math-problems-2013-3?op=1

http://www.businessinsider.com/controversial-math-problems-markov-chain-cantor-coin-flip-2013-5#-1

http://www.slideshare.net/BorizN/most-controversial-math-problems

http://myscienceacademy.org/2013/04/20/the-12-most-controversial-facts-in-mathematics/

http://www.thescienceforum.com/mathematics/22826-controversial-math-problem.html