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On local uniqueness of normalized Nash equilibria

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  • Vladimir Shikhman

Abstract

For generalized Nash equilibrium problems (GNEP) with shared constraints we focus on the notion of normalized Nash equilibrium in the nonconvex setting. The property of nondegeneracy for normalized Nash equilibria is introduced. Nondegeneracy refers to GNEP-tailored versions of linear independence constraint qualification, strict complementarity and second-order regularity. Surprisingly enough, nondegeneracy of normalized Nash equilibrium does not prevent from degeneracies at the individual players' level. We show that generically all normalized Nash equilibria are nondegenerate. Moreover, nondegeneracy turns out to be a sufficient condition for the local uniqueness of normalized Nash equilibria. We emphasize that even in the convex setting the proposed notion of nondegeneracy differs from the sufficient condition for (global) uniqueness of normalized Nash equilibria, which is known from the literature.

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  • Vladimir Shikhman, 2022. "On local uniqueness of normalized Nash equilibria," Papers 2205.13878, arXiv.org.
    • Handle: RePEc:arx:papers:2205.13878
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    References listed on IDEAS

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    1. D. Dorsch & H. T. Jongen & V. Shikhman, 2013. "On Intrinsic Complexity of Nash Equilibrium Problems and Bilevel Optimization," Journal of Optimization Theory and Applications, Springer, vol. 159(3), pages 606-634, December.
    2. Masao Fukushima, 2011. "Restricted generalized Nash equilibria and controlled penalty algorithm," Computational Management Science, Springer, vol. 8(3), pages 201-218, August.
    3. Koichi Nabetani & Paul Tseng & Masao Fukushima, 2011. "Parametrized variational inequality approaches to generalized Nash equilibrium problems with shared constraints," Computational Optimization and Applications, Springer, vol. 48(3), pages 423-452, April.
    4. Francisco Facchinei & Christian Kanzow, 2010. "Generalized Nash Equilibrium Problems," Annals of Operations Research, Springer, vol. 175(1), pages 177-211, March.
    5. DORSCH, Dominik & JONGEN, Hubertus Th. & SHIKHMAN, Vladimir, 2013. "On structure and computation of generalized Nash equilibria," LIDAM Reprints CORE 2525, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
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