'''Gregori Perelman''' is a Russian mathematician, notable for proving the [[Poincaré conjecture]]. He is also the only person to ever turn down the prestigious [[Fields Medal|Fields medal]], and has chosen to leave mathematical work after his proof was published. | '''Gregori Perelman''' is a Russian mathematician, notable for proving the [[Poincaré conjecture]]. He is also the only person to ever turn down the prestigious [[Fields Medal|Fields medal]], and has chosen to leave mathematical work after his proof was published. |