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A Two-Phase Algorithm for a Variational Inequality Formulation of Equilibrium Problems

Author

Listed:
  • J. Y. Bello Cruz

    (Universidade Federal de Goiás)

  • P. S. M. Santos

    (Universidade Federal Piauí)

  • S. Scheimberg

    (Universidade Federal do Rio de Janeiro)

Abstract

We introduce an explicit algorithm for solving nonsmooth equilibrium problems in finite-dimensional spaces. A particular iteration proceeds in two phases. In the first phase, an orthogonal projection onto the feasible set is replaced by projections onto suitable hyperplanes. In the second phase, a projected subgradient type iteration is replaced by a specific projection onto a halfspace. We prove, under suitable assumptions, convergence of the whole generated sequence to a solution of the problem. The proposed algorithm has a low computational cost per iteration and, some numerical results are reported.

Suggested Citation

  • J. Y. Bello Cruz & P. S. M. Santos & S. Scheimberg, 2013. "A Two-Phase Algorithm for a Variational Inequality Formulation of Equilibrium Problems," Journal of Optimization Theory and Applications, Springer, vol. 159(3), pages 562-575, December.
    • Handle: RePEc:spr:joptap:v:159:y:2013:i:3:d:10.1007_s10957-012-0181-8
    DOI: 10.1007/s10957-012-0181-8
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    References listed on IDEAS

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    1. A. Heusinger & C. Kanzow, 2009. "Relaxation Methods for Generalized Nash Equilibrium Problems with Inexact Line Search," Journal of Optimization Theory and Applications, Springer, vol. 143(1), pages 159-183, October.
    2. J. Bello Cruz & A. Iusem, 2010. "Convergence of direct methods for paramonotone variational inequalities," Computational Optimization and Applications, Springer, vol. 46(2), pages 247-263, June.
    3. I.V. Konnov, 2003. "Application of the Proximal Point Method to Nonmonotone Equilibrium Problems," Journal of Optimization Theory and Applications, Springer, vol. 119(2), pages 317-333, November.
    4. A. Nedić & A. Ozdaglar, 2009. "Subgradient Methods for Saddle-Point Problems," Journal of Optimization Theory and Applications, Springer, vol. 142(1), pages 205-228, July.
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