Presents methods for finding or approximating Nash equilibria for infinite games and for intractably large finite games.

If each player has chosen a strategy and no player can benefit by changing his strategy while the other players keep theirs unchanged, then the set of strategy choices constitutes a Nash equilibrium. Nash equilibria must exist for all finite games.

The tragedy of the commons is a phrase used to refer to a class of phenomena that involve a conflict for resources between individual interests and the common good.