Abstract and Applied Analysis

Volume 2007 (2007), Article ID 18187, 21 pages

doi:10.1155/2007/18187

## Existence and Multiplicity of Positive Solutions for Dirichlet Problems in Unbounded Domains

# Tsung-Fang Wu

Department of Applied Mathematics, National University of Kaohsiung, Kaohsiung 811, Taiwan

Received 30 September 2006; Revised 26 December 2006; Accepted 3 January 2007

Academic Editor: Vy Khoi Le

Copyright © 2007 Tsung-Fang Wu. 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.

#### Abstract

We consider the elliptic problem