Copyright © 2010 Jinhua Wang and Hongjun Xiang. 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.
The upper and lower solutions method is used to study the -Laplacian fractional boundary value problem , , , , , and , where . Some new results on the existence of at least one positive solution are obtained. It is valuable to point out that the nonlinearity can be singular at or