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Using variational methods, we investigate the solutions to the boundary value problems for fractional order differential equations. First, we consider the eigenvalue problem associated with it. Then, we obtain the existence of at least two weak solutions for every real number via Brezis and Nirenberg’s Linking Theorem. Furthermore, for every positive integer k, the existence criteria of k pairs of weak solutions are established by using Clark Theorem. At last, some examples are also given to illustrate the results. c ©2016 All rights reserved.

Weak solutions to boundary value problems for fractional differential equations via variational methods