Definition:Millennium Problems

Definition
The Millennium problems are a collection of seven mathematical problems stated by the on $24$ May $2000$.

Each carries a prize of $\$1 \, 000 \, 000$ (US dollars).

Six of them remain unsolved.

They are as follows:

The Poincaré Conjecture
This is the only one of the seven to be solved so far:

Also known as
Can also be referred to as the Millennium Prize problems.