Solvability of boundary value problems of nonlinear fractional differential equations

In this paper, we study the existence of multiple positive solutions for the nonlinear fractional differential equation boundary value problem D0+αu(t)+f(t,u(t))=0$D^{\alpha}_{0^{+}}u(t)+f(t,u(t))=0 $, 0<t<1$0< t<1$, u(0)=u(1)=u′(0)=0$u(0)=u(1)=u'(0)=0$, where 2<α≤3$2<\alpha\leq3$ is a real number, D0+α$D^{\alpha}_{0^{+}}$ is the Riemann-Liouville fractional derivative. By the properties of the Green’s function, the lower and upper solution method and the Leggett-Williams fixed point theorem, some new existence criteria are established. As applications, examples are presented to illustrate the main results.

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