Geodesic
Limit relations for model systems in the case of a degenerate state of statistical equilibrium
Teoretičeskaâ i matematičeskaâ fizika, Tome 29 (1976) no. 3, pp. 388-393 
N. N. Bogolyubov (Jr.); A. G. Shumovskaya; A. S. Shumovskii. Limit relations for model systems in the case of a degenerate state of statistical equilibrium. Teoretičeskaâ i matematičeskaâ fizika, Tome 29 (1976) no. 3, pp. 388-393. http://geodesic.mathdoc.fr/item/TMF_1976_29_3_a9/
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Voir la notice de l'article provenant de la source Math-Net.Ru

For a class of model systems that admit solution in the framework of the method of approximating Hamiltonians a necessary and sufficient condition is established for asymptotic closeness of the model and approximating densities of the free energy in the case of a degenerate state of statistical equilibrium.

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[12] I. G. Brankov, A. S. Shumovskii, Preprint OIYaI R4-6899, Dubna, 1973 | MR | Zbl