One of the greatest mathematicians of our time is Grigori Perelman. Perelman solved one of the most difficult problems in mathematics that has puzzled mathematicians for a hundred years, the Poincaré Conjecture.
The Poincaré Conjecture was posted by Henri Poincaré in 1904. It was one of the seven Millenium Prize Problems, the most difficult mathematics problems selected by the Clay Mathematics Institute. A correct solution to any of the unsolved problems can earn the author 1 million dollars. As of this writing, the remaining six problems are still unsolved. » Read more