Externalities, Nonconvexities, and Fixed Points

[42] Ward, L. E., Jr. (1958) “A Fixed Point Theorem for Multi-Valued Functions,”Pacific Journal of Mathematics 8, 921-927.[43] Ward, L. E., Jr. (1961) “Characterization of the Fixed Point Property for a Classof Set-Valued Mappings,” Fundamenta Mathematicae 50, 159-164.[44] Whyburn, G. T. (1942) Analytic Topology, American Mathematical Society ColloquiumPublication 28, Providence. (reprinted with corrections 1971).[45] Wilansky, A (1978) Modern Methods in Topological Vector Spaces, McGraw-Hill,New York.[46] Willard, S. (1970) General Topology, Addison-Wesley, Reading Massachusetts.[47] Yu, J., Yang, H., and Xiang, S. (2005) “Unified Approach to Existence andStability of Essential Components,” Nonlinear Analysis 63, e2415-e2425.[48] Zhou, Y., Xiang, S., and Yang, H. (2005) “Stability of Solutions for Ky Fan’sSection Theorem with Some Applications,” Nonlinear Analysis 62, 1127-1136.60