“…It has been shown that the equilibrium problem provides a natural, novel and unified framework to study a wide class of problems arising in nonlinear analysis, optimization, economics, finance and game theory. The equilibrium problem includes many mathematical problems as particular cases such as mathematical programming problems, complementarity problem, variational inequality problems, fixed point problems, minimax inequality problems, Nash equilibrium problems in non-cooperative games, etc., see [1,2,4,6,11].…”