Copyright © 2009 Jian Liu and Yanbin Sang. 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.
By using the fixed-point index theorem, we consider the existence of positive
solutions for the following nonlinear higher-order four-point singular boundary value problem
on time scales , ; , ; , ; , , where , , , , , , , and is rd-continuous.