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Noncoercive and noncontinuous equilibrium problems: existence theorem in infinite-dimensional spaces

Author

Listed:
  • F. Fakhar

    (University of Isfahan)

  • H. R. Hajisharifi

    (University of Isfahan
    Institute for Research in Fundamental Sciences (IPM))

  • Z. Soltani

    (University of Kashan)

Abstract

In this paper, we extend the definition of the qx-asymptotic functions, for an extended real-valued function defined on the infinite-dimensional topological normed spaces without lower semicontinuity or quasi-convexity condition. As the main result, by using some asymptotic conditions, we obtain sufficient optimality conditions for the existence of solutions to equilibrium problems, under weaker assumptions of continuity and convexity, when the feasible set is an unbounded subset of infinite-dimensional space. Also, as a corollary, we obtain necessary and sufficient optimality conditions for the existence of solutions to equilibrium problems with an unbounded feasible set. Finally, as an application, we establish a result for the existence of solutions to minimization problems.

Suggested Citation

  • F. Fakhar & H. R. Hajisharifi & Z. Soltani, 2023. "Noncoercive and noncontinuous equilibrium problems: existence theorem in infinite-dimensional spaces," Journal of Global Optimization, Springer, vol. 86(4), pages 989-1003, August.
    • Handle: RePEc:spr:jglopt:v:86:y:2023:i:4:d:10.1007_s10898-023-01289-6
    DOI: 10.1007/s10898-023-01289-6
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    References listed on IDEAS

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    1. Xinyu Zhang & Chunyan Yang & Renjie Han & Shiqing Zhang, 2024. "Nash’s Existence Theorem for Non-Compact Strategy Sets," Mathematics, MDPI, vol. 12(13), pages 1-10, June.

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