Existence of Positive Solutions of Nonlinear Second-Order Periodic Boundary Value Problems
Department of Mathematics, Northwest Normal University, Lanzhou 730070, China
Boundary Value Problems 2010, 2010:626054 doi:10.1155/2010/626054Published: 25 November 2010
This paper is devoted to study the existence of periodic solutions of the second-order equation , where is a Carathéodory function, by combining a new expression of Green's function together with Dancer's global bifurcation theorem. Our main results are sharp and improve the main results by Torres (2003).