The **Millennium Prize Problems** are seven problems in mathematics that were stated in 2000. These problems are old problems. Nowadays, **six of the seven problems remain unsolved**. A correct solution to any of the problems results in a one million dollar prize. **$1,000,000** is about 800,000 euros.

The only solved problem is the so-called **Poincaré conjecture** (now is called Poincaré theorem as it has already been proven). The problem was originally posed by the French mathematician Poincaré **in 1904**, and** it wasn't solved until a century later** by the Russian mathematician Grigori **Perelman**. He was award in 2010 with the $1,000,000 prize but... **he declined the prize! (wow!)**

Perelman also declined** the Field Medal** (the most relevant prize in mathematics). He said that:

*"Everybody understood that if the proof is correct, then no other recognition is needed. I'm notinterested in money or fame''*

To conclude, here you have the list of the 6 problems that still remain unsolved (just in case you want to think about them):

- The Riemann Hypothesis
- Yang-Mills Theory and the Mass Gap Hypothesis
- The P vs. NP problem
- The Navier-Stokes Equations
- The Birch and Swinnerton-Dyer Conjecture
- The Hodge Conjecture

References:

K. Devlin. *The Millennium Problems*. Basic Books (2002)

https://en.wikipedia.org/wiki/Millennium_Prize_Problems

https://en.wikipedia.org/wiki/Grigori_Perelman#The_Fields_Medal_and_Millennium_Prize

http://www.theguardian.com/books/2011/mar/27/perfect-rigour-grigori-perelman-review

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