Geodesic
The first four corrections of the perturbation theory for discrete semi bounded from below operators with free multiplicities of eigenvalues finding
Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie, no. 9 (2011), pp. 16-21

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In this paper received analytical formulas for calculation first four corrections of the perturbation theory for discrete semi bounded from below operators, when eigenvalues of unperturbed operators have free multiplicities.
Keywords: corrections of the perturbation theory, discrete operators, eigenvalues, eigenfunctions. 
S. I. Kadchenko; S. N. Kakushkin. The first four corrections of the perturbation theory for discrete semi bounded from below operators with free multiplicities of eigenvalues finding. Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie, no. 9 (2011), pp. 16-21. http://geodesic.mathdoc.fr/item/VYURU_2011_9_a1/
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