Abstract
ABSTRACTIn this paper, we discuss a class of eigenvalue problems of fractional differential equations of order with variable coefficients. The method of solution is based on utilizing the fractional series solution to find theoretical eigenfunctions. Then, the eigenvalues are determined by applying the associated boundary conditions. A notable result, for certain cases, is that the eigenfunctions are characterized in terms of the Mittag-Leffler or semi Mittag-Leffler functions. The present findings demonstrate, for certain cases, the existence of a critical value at which the problem has no eigenvalue (for ), only one eigenvalue (at ), a finite or infinitely many eigenvalues (for ). The efficiency and accuracy of the present algorithm are demonstrated through several numerical examples.
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