Geodesic
Jordan--Dirichlet theorem for functional differential operator with involution
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 3, pp. 9-14

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In this paper the problem of decomposability of a function $f(x)$ into Fourier series with respect to the system of eigenfunctions of a functional-differential operator with involution $Ly=y'(1-x)+\alpha y'(x)+p_1(x)y(x)+p_2(x)y(1-x)$, $y(0)=\gamma y(1)$ is investigated. Based on the study of the resolvent of the operator easier and using the method of contour integration of the resolvent, we obtain the sufficient conditions for the convergence of the Fourier series for a function $f(x)$ (analogue of the Jordan–Dirichlet's theorem). 
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     author = {M. Sh. Burlutskaya},
     title = {Jordan--Dirichlet theorem for functional differential operator with involution},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
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M. Sh. Burlutskaya. Jordan--Dirichlet theorem for functional differential operator with involution. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 3, pp. 9-14. http://geodesic.mathdoc.fr/item/ISU_2013_13_3_a1/