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Equilibrium problems with lower and upper bounds |
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| Institution: | Department of Applied Mathematics National Sun Yat-sen University Kaohsiung, Taiwan 80424, R.O.C. |
| Abstract: | In this paper, we obtain some existence results of equilibrium problems with lower and upper bounds by employing a fixed-point theorem due to Ansari and Yao 1] and Ky Fan Lemma 2], respectively. Our results give answers to the open problem raised by Isac, Sehgal and Singh 3]. |
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