Multiple positive solutions of a singular fractional differential equation with negatively perturbed term
Let D-0+(alpha) be the standard Riemann-Liouville derivative. Wediscuss the existence of multiple positive solutions for the following fractional differential equation with a negatively perturbed term [-D-0+(alpha) u(t) = p(t)f(t, u(t)) - q(t), 0   [0,+infinity) is Lebesgue integrable and may be singular at some zero measures set of [ 0,1], which implies the nonlinear term may change sign. (C) 2011 Elsevier Ltd. All rights reserved.
multiple positive solutions fractional differential equation perturbed term green function