Volume 37 • Number 2 • 2014   • Positive Solutions for Second-order Differential Equations with Integral Boundary Conditions Jiang Ji-Qiang, Liu Li-Shan and Wu Yong-Hong Abstract. This paper studies the existence of positive solutions for a class of second-order semipositone differential equations with a negatively perturbed term and integral boundary conditions. By using a well-known fixed-point index theorem, some new existence results are derived for the case where nonlinearity is allowed to be sign changing. Several examples are presented to demonstrate the application of our main. 2010 Mathematics Subject Classification: 34B15, 34B18 Full text: PDF