Positive solutions for nonlinear fractional differential equations with coefficient that changes sign Original Research Article

In this paper, we investigate the existence of positive solutions in case of the nonlinear fractional differential equation View the MathML sourceDsu=λa(t)f(u),00f(0)>0, a:[0,1]→(-∞,+∞)a:[0,1]→(-∞,+∞) may change sign, and λ>0λ>0 is a parameter. Our analysis relies on a nonlinear alternative of Leray–Schauder type.