One of those seven is known as the Poincare Conjecture, which states: “Every three-dimensional topological manifold which is closed, connected, and has trivial fundamental group is homeomorphic ...

Grigory Perelman proved the Poincare conjecture in 2002-2003 and turned down a $1 million prize awarded to him NEW YORK, May 31. /TASS/. US entrepreneur Elon Musk has admired Russian mathematician ...