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About the Russian scientist Grigory Perelman, who proved the Poincaré conjecture. Mathematicians around the world could not prove it for about a century, at the moment it is the only solved ... Read allAbout the Russian scientist Grigory Perelman, who proved the Poincaré conjecture. Mathematicians around the world could not prove it for about a century, at the moment it is the only solved mathematical problem out of the seven problems of the millennium.About the Russian scientist Grigory Perelman, who proved the Poincaré conjecture. Mathematicians around the world could not prove it for about a century, at the moment it is the only solved mathematical problem out of the seven problems of the millennium.