How hard is it to approximate the best Nash equilibrium?

@inproceedings{Hazan2009HowHI,
  title={How hard is it to approximate the best Nash equilibrium?},
  author={Elad Hazan and Robert Krauthgamer},
  booktitle={SODA},
  year={2009}
}
The quest for a polynomial-time approximation scheme (PTAS) for Nash equilibrium in a two-player game, which emerged as a major open question in algorithmic game theory, seeks to circumvent the PPAD-completeness of finding an (exact) Nash equilibrium by finding an approximate equilibrium. The closely related problem of finding an equilibrium maximizing a certain objective, such as social welfare, was shown to be NP-hard [Gilboa and Zemel, Games Econom. Behav., 1 (1989), pp. 80–93]. However… CONTINUE READING
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