Abstract
In this paper, we first introduce the new notions of \(\overline{{\mathbb {R}}}_+\)-local-intersection property, \(\overline{{\mathbb {R}}}_+\)-local-inclusion property, \(\overline{{\mathbb {R}}}_+\)-strongly transfer lower semicontinuity, \({\mathbb {R}}_-\)-weakly transfer lower semicontinuity and \({\mathbb {R}}_-\)-strongly transfer lower semicontinuity for a set-valued mapping \(\Phi \) in topological vector spaces. Then, using these notions, we characterize the existence of set-valued equilibrium without assuming any form of convexity of function and/or convexity and compactness of sets. Furthermore, we apply the basic results obtained in the paper to Browder variational inclusion, with weekend conditions on the involved set-valued operators and provide an affirmative answer to some open question posed by Alleche and Rǎdulescu in their final remark of (Optim Lett, 2018. https://doi.org/10.1007/s11590-1233-2). Some application of our results to characterize the existence of set-valued pure strategy Nash equilibrium in games with discontinuous and non-convex payoff functions and nonconvex and/or noncompact strategy spaces is presented. Finally, we characterize the existence of single-valued equilibrium problem without assuming any form of convexity of function and/or convexity and compactness of sets in the setting of topological vector spaces. Our results improve and generalize many known results in the current literature.
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The authors would like to thank the editor and anonymous referee for careful reading of the paper, valuable suggestions and constructive comments which improved the paper significantly.
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Eslamizadeh, L., Naraghirad, E. Existence of solutions of set-valued equilibrium problems in topological vector spaces with applications. Optim Lett 14, 65–83 (2020). https://doi.org/10.1007/s11590-019-01488-9
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DOI: https://doi.org/10.1007/s11590-019-01488-9