Claimed proof of the Poincaré conjecture is back in the news The Poincaré conjecture, first proposed in 1904 by H. Poincaré, one of the problems that the Clay Mathematics Institute is offering one million for a solution in math is back in the news as mathematicians are coming closer to accepting the solution of Dr Grigori Perelman, of the Steklov Institute of Mathematics. The conjecture states that every simply connected closed 3-manifold is homeomorphic to the 3-sphere. The BBC has a nice story on it, as does the Scotsman. Don’t believe what you read in the Scotsman about the proof of the Riemann hypothesis, that problem is still to be solved.