Semnan University International Journal of Nonlinear Analysis and Applications 2008-6822 8 1 2017 07 01 Existence results for equilibrium problems under strong sign property 165 176 2498 10.22075/ijnaa.2017.2498 EN Somaye Jafari Department of Mathematics, Razi University, Kermanshah Ali Farajzadeh Department of Mathematics, Razi University, Kermanshah Journal Article 2015 07 04 This paper concerns equilibrium problems in real metric linear spaces. Considering a modified notion of  upper sign property for bifunctions, we obtain the relationship between the solution sets of the local Minty equilibrium problem and the equilibrium problem, where the technical conditions on $f$ used in the literature are relaxed. The KKM technique is used to generalize and unify some existence results for the relaxed $\mu$-quasimonotone equilibrium problems in the literature. https://ijnaa.semnan.ac.ir/article_2498_1ac673c544179be70aa77273e99be930.pdf