# Clay Mathematics Institute

The **Clay Mathematics Institute** (**CMI**) is a private, non-profit foundation, based in Cambridge, Massachusetts, and dedicated to increasing and disseminating mathematical knowledge. It gives out various awards and sponsorships to promising mathematicians. The institute was founded in 1998 by businessman Landon T. Clay, who financed it, and Harvard mathematician Arthur Jaffe.

## The Millennium Prize problems

The institute is best known for its establishment on May 24, 2000 of the **Millennium Prize problems**. These seven problems are considered by CMI to be "important classic questions that have resisted solution over the years". The first person to solve each problem will be awarded $1,000,000 by CMI - thus solving all the problems will amount to $7,000,000. In announcing the prize, CMI drew a parallel to Hilbert's problems, which were proposed in 1900, and had a substantial impact on 20th century mathematics.

The seven Millennium Prize problems are:

- P versus NP
- The Hodge conjecture
- The Poincaré conjecture
- The Riemann hypothesis
- Yang-Mills existence and mass gap
- Navier-Stokes existence and smoothness
- The Birch and Swinnerton-Dyer conjecture

### P versus NP

The question is whether there are any problems for which a computer can verify a given solution quickly, but cannot find the solution quickly. This is generally considered the most important open question in theoretical computer science. See complexity classes P and NP for a more complete discussion.

### The Hodge conjecture

The Hodge conjecture is that for projective algebraic varieties, Hodge cycles are rational linear combinations of algebraic cycles.

### The Poincaré conjecture

In topology, a sphere with a two-dimensional surface is essentially characterized by the fact that it is simply connected. The Poincaré conjecture is that this is also true for spheres with three-dimensional surfaces. The question has been solved for all dimensions above three. Solving it for three is central to the problem of classifying 3-manifolds. A solution to this conjecture has been proposed by Grigori Perelman; while still not formally published, there does appear to be a growing consensus that the argument is largely correct.

### The Riemann hypothesis

The Riemann hypothesis is that all nontrivial zeros of the Riemann zeta function have a real part of 1/2. A proof or disproof of this would have far-reaching implications in number theory, especially for the distribution of prime numbers. This was Hilbert's eighth problem, and is still considered an important open problem a century later. Louis de Branges de Bourcia, a French mathematician, claimed to have the proof for the problem, unfortunately this proof has not been yet seriously analyzed.

### Yang-Mills existence and mass gap

In physics, quantum Yang-Mills theory describes particles with positive mass having classical waves traveling at the speed of light. This is the mass gap. The problem is to establish the existence of the Yang-Mills theory and a mass gap.

The Navier-Stokes equations describe the movement of liquids and gases. Although they were found in the 19th century, they still are not well understood. The problem is to make progress toward a mathematical theory that will give us insight into these equations.

### The Birch and Swinnerton-Dyer conjecture

The Birch and Swinnerton-Dyer conjecture deals with a certain type of equation, those defining elliptic curves over the rational numbers. The conjecture is that there is a simple way to tell whether such equations have a finite or infinite number of rational solutions. Hilbert's tenth problem dealt with a more general type of equation, and in that case it was proven that there is no way to decide whether a given equation even has any solutions.

## Other activities

Besides the Millennium Prize Problems, the Clay Mathematics Institute also supports mathematics via the awarding of research fellowships (which range from two to five years, and are aimed at younger mathematicians), as well as shorter-term scholarships for programs, individual research, and book writing. The Institute also has a yearly Clay Research Award, recognizing major breakthroughs in mathematical research. Finally, the Institute also organizes a number of summer schools, conferences, workshops, public lectures, and outreach activities aimed primarily at junior mathematicians (from the high school to postdoctoral level).

## Bibliography

Keith J. Devlin, *The Millennium Problems: The Seven Greatest Unsolved Mathematical Puzzles of Our Time*, Basic Books (October, 2002), ISBN 0465017290.

## External links

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