You don't need to solve this, just tell me what problem it is... although if you do solve it you'll be a million dollars richer.
Prove the existence of smooth solutions to a certain model of incompressible fluid dynamics. This is the ... problem?
Answers and Replies
It's the Navier-stokes problem and Clay Mathematics institute offers 1 million dollars prize to solve it or 6 other different problems (possibly 5 because the Poincare conjecture seems to have been solved recently)