Equilibrium problems with lower and uppe
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O. Chadli; Y. Chiang; J.C. Yao
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Article
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2002
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Elsevier Science
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English
โ 255 KB
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].