We discuss the existence of positive solutions to the following fractional m-point boundary value problem with changing sign nonlinearity , where is a positive parameter, , , with , is the standard Riemann-Liouville derivative, and may be singular at and/or and also may change sign. The work improves and generalizes some previous results.
"Positive Solutions for a Fractional Boundary Value Problem with Changing Sign Nonlinearity." Abstr. Appl. Anal. 2012 (SI01) 1 - 17, 2012. https://doi.org/10.1155/2012/214042