Copyright © 2011 Mouffak Benchohra et al. 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 nonlinear alternative of the Leray Schauder type and the
Banach contraction principle are used to investigate the existence of solutions
for second-order differential equations with integral boundary conditions. The
compactness of solutions set is also investigated.