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On Generalized Quasi-Vector Equilibrium Problems via Scalarization Method

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Abstract

In this paper, we consider the nonlinear scalarization function in the setting of topological vector spaces and present some properties of it. Moreover, using the nonlinear scalarization function and Fan–Glicksberg–Kakutani’s fixed point theorem, we obtain an existence result of a solution for a generalized vector quasi-equilibrium problem without using any monotonicity and upper semi-continuity (or continuity) on the given maps. Our result can be considered as an improvement of the known corresponding result. After that, we introduce a system of generalized vector quasi-equilibrium problem which contains Nash equilibrium and Debreu-type equilibrium problem as well as the system of vector equilibrium problem posed previously. We provide two existence theorems for a solution of a system of generalized vector quasi-equilibrium problem. In the first one, our multi-valued maps have closed graphs and the maps are continuous, while in the second one, we do not use any continuity on the maps. Moreover, the method used for the existence theorem of a solution of a system of generalized vector quasi-equilibrium problem is not based upon a maximal element theorem. Finally, as an application, we apply the main results to study a system of vector optimization problem and vector variational inequality problem.

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Authors and Affiliations

  1. Department of Mathematics, Razi University, Kermanshah, 67149, Iran

    Ali Farajzadeh

  2. Department of Mathematics, Kyungsung University, Busan, 608-736, Republic of Korea

    Byung Soo Lee

  3. Department of Mathematics, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand

    Somyot Plubteing

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  1. Ali Farajzadeh
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  2. Byung Soo Lee
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  3. Somyot Plubteing
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Correspondence to Byung Soo Lee.

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Farajzadeh, A., Lee, B.S. & Plubteing, S. On Generalized Quasi-Vector Equilibrium Problems via Scalarization Method. J Optim Theory Appl 168, 584–599 (2016). https://doi.org/10.1007/s10957-015-0772-2

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