Some existence theorems for the inclusion 0 is an element of A(x)

[摘要] Given a multifunction A from a topological space X into the topological dual E* of a real topological vector space E, we deal with the problem of finding x is an element of X such that O-E* is an element of A(x). Some existence results for the last inclusion are proved. In particular, we extend to multi-valued operators the main result of B. Ricceri (J.Convex. Anal. 2, 1995, 287-290). (C) 1997 Academic Press.

[发布日期] 1997-09-01