English

On the Uniqueness of Nash Equilibria in Multiagent Matrix Games

Computer Science and Game Theory 2024-10-23 v1

Abstract

We provide a complete characterization for uniqueness of equilibria in unconstrained polymatrix games. We show that while uniqueness is natural for coordination and general polymatrix games, zero-sum games require that the dimension of the combined strategy space is even. Therefore, non-uniqueness is common in zero-sum polymatrix games. In addition, we study the impact of non-uniqueness on classical learning dynamics for multiagent systems and show that the classical methods still yield unique estimates even when there is not a unique equilibrium.

Keywords

Cite

@article{arxiv.2410.16548,
  title  = {On the Uniqueness of Nash Equilibria in Multiagent Matrix Games},
  author = {James P. Bailey},
  journal= {arXiv preprint arXiv:2410.16548},
  year   = {2024}
}