# The Clay Mathematics Institute

### Enhancement and Partnership Program

The principal aim of the program is to enhance activities that are already planned and financially viable. It is most commonly used to support a small number of highly distinguished speakers at a conference or workshop, but the program also provides funds for other forms of partnership, including graduate summer schools and similar events. The call for proposals for activities taking place after September 30, 2017 is open.

## Millennium Problems

In 1904 the French mathematician Henri Poincaré asked if the three dimensional sphere is characterized as the unique simply connected three manifold. This question, the Poincaré conjecture, was a special case of Thurston's geometrization conjecture. Perelman's proof tells us that every three manifold is built from a set of standard pieces, each with one of eight well-understood geometries.