Fields Medals, which are known as Nobel Prize for mathematicians, were awarded during the opening ceremony of the International Congress of Mathematicians in Madrid, Spain.
      
      Fields awardees are Russians Andrey Okunkov and Grigory Perelman, despite his rejection to take the medal, and Wendelin Werner from France and Terence Tao from Australia.
      
      Grigory Perelman’s Fields Medal was awarded for his proof of the Poincare hypothesis, which remained unsolved for about a century since 1904. This problem was listed among seven most difficult mathematical problems of the millennium.
      
      Press service of the International Congress of Mathematicians reports that Mr. Perelman rejected the medal and even did not arrived to the Congress. The weird scientist has also rejected some other prizes and scientific degrees.
      
      Source: ITAR-TASS