Volume 8, Number 3, 2018, Pages 938953 DOI：10.11948/2018.938 
Nontrivial solutions of nonlocal boundary value problems for nonlinear higherorder singular fractional differential equations 
Shengli Xie,Yiming Xie 
Keywords:Singular fractional differential equation, nontrivial solution, topological degree, RiemannLiouville fractional derivative. 
Abstract: 
This paper deals with the existence and multiplicity of nontrivial solutions of nonlocal boundary value problems for nonlinear higherorder singular fractional differential equations with signchanging nonlinear term. The main tool used in the proof is topological degree theory. Some examples explain that our results cannot be obtained by the method of cone theory. 
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