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 Cet article a éte moissonné depuis la source Math-Net.Ru

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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. 
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     journal = {Vestnik \^U\v{z}no-Uralʹskogo gosudarstvennogo universiteta. Seri\^a, Matemati\v{c}eskoe modelirovanie i programmirovanie},
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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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