摘要

Let X be a real reflexive Banach space, K subset of X a nonempty, closed and convex set, and F : K x K -> 2(X) (the family of all the subsets of X) be a multi-valued mapping. In this paper, we consider the following extended inclusion problem: find x* is an element of K such that K subset of F(x*, x*). Under suitable conditions, we establish an existence result for the extended inclusion problem. As applications, we give some existence theorems for equilibrium problems.