Department of Natural Sciences, Center for General Education, Chang Gung University, Tao-Yuan 333, Taiwan
Academic Editor: Wenming Z. Zou
Copyright © 2010 Tsing-San Hsu and Huei-Li Lin. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Assume that is a positive continuous function in
satisfies the suitable conditions. We prove that the Dirichlet problem admits at least three positive solutions in an exterior domain.