Nontrivial Solutions of Singular Sign-Changing Nonlinear Dirichlet-Type Fractional Differential Equation

By establishing a new Leray-Schauder degree theo rem for a completely continuous field, we dealt with the existence of nontrivial solutions for a class of singular sign-changing nonlinear Dirichlet-type fractional differential equation. This work improves and generalizes the previous existence results for both integer fractional differential equations and fractional differential equations.