Center for General Education, Chang Gung University, Kwei-San, Tao-Yuan 333, Taiwan
Copyright © 2009 Tsing-San Hsu. 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.
We show that if and satisfy some suitable conditions,
then the Dirichlet problem in has a solution that changes sign
in , in addition to two positive solutions where is
an unbounded cylinder domain in .