by Constantinos Daskalakis, Paul W. Goldberg, Christos H. Papadimitriou
http://www.cs.berkeley.edu/~christos/papers/ppad.ps
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Abstract:
We resolve the question of the complexity of Nash equilibrium by showing that the problem of computing a Nash equilibrium in a game with 4 or more players is complete for the complexity class PPAD. Our proof uses ideas from the recently-established equivalence between polynomialtime solvability of normal-form games and graphical games, and shows that these kinds of games can implement arbitrary members of a PPAD-complete class of Brouwer functions. 1
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