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Equilibrium problems with lower and upper bounds. (English) Zbl 1175.90411
Summary: We obtain some existence results of equilibrium problems with lower and upper bounds by employing a fixed-point theorem due to Ansari and Yao and Ky Fan Lemma, respectively. Our results give answers to the open problem raised by Isac, Sehgal and Singh.

90C47 Minimax problems in mathematical programming
47H10 Fixed-point theorems
47N10 Applications of operator theory in optimization, convex analysis, mathematical programming, economics
49J40 Variational inequalities
Full Text: DOI
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