Abstract
A well-known technique for the solution of quasi-variational inequalities (QVIs) consists in the reformulation of this problem as a constrained or unconstrained optimization problem by means of so-called gap functions. In contrast to standard variational inequalities, however, these gap functions turn out to be nonsmooth in general. Here, it is shown that one can obtain an unconstrained optimization reformulation of a class of QVIs with affine operator by using a continuously differentiable dual gap function. This extends an idea from Dietrich (J. Math. Anal. Appl. 235:380–393 [24]). Some numerical results illustrate the practical behavior of this dual gap function approach.
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Acknowledgments
The authors would like to thank Oliver Stein for his comments on an earlier draft of this paper. This research was partially supported by the Deutsche Forschungsgemeinschaft (DFG) under Grant KA 1296/18-1 as well as by a Grant from the international doctorate program “Identification, Optimization, and Control with Applications in Modern Technologies” within the Elite-Network of Bavaria.
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Communicated by Patrice Marcotte.
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Harms, N., Hoheisel, T. & Kanzow, C. On a Smooth Dual Gap Function for a Class of Quasi-Variational Inequalities. J Optim Theory Appl 163, 413–438 (2014). https://doi.org/10.1007/s10957-014-0536-4
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DOI: https://doi.org/10.1007/s10957-014-0536-4
Keywords
- Quasi-variational inequality
- Set-valued mapping
- Regularized gap function
- DC optimization
- Conjugate function
- Dual gap function
- \(\mathrm{PC}^1\) function
- Nonconvex duality