Institute of Systems Science and Mathematics, Naval Aeronautical and Astronautical University, Yantai, Shandong 264001, China
Copyright © 2010 Yang Shujie and Shi Bao. 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 consider the Green's functions and the existence of positive solutions
for a second-order functional difference equation with four-point boundary conditions.