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Spheres in Disguise: Solid proof offered for famous conjecture

A Russian mathematician may have finally cracked one of the most famous problems in mathematics: the Poincaré conjecture, a question about the shapes of three-dimensional spaces. If his work is correct, it will make him eligible for a $1 million prize from the Clay Mathematics Institute in Cambridge, Mass., which has declared the conjecture one of the seven most important mathematical problems of the new millennium.

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