Nanjing University of Aeronautics and Astronautics, 29 Yudao st., Nanjing 210016, China
Copyright © 2010 Liyuan Zhang and Yukun An. 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 study the existence and multiplicity of positive
solutions of the following boundary-value problem: , , , where R+ → R+ is continuous, , , and satisfy some suitable assumptions.