Geodesic
Generalization of the minimax principle for model quasispin problems
Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 2, pp. 258-265 
N. N. Bogolyubov (Jr.); A. G. Shumovskaya; A. S. Shumovskii. Generalization of the minimax principle for model quasispin problems. Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 2, pp. 258-265. http://geodesic.mathdoc.fr/item/TMF_1974_21_2_a10/
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Voir la notice de l'article provenant de la source Math-Net.Ru

The free energy in the thermodynamic limit is investigated for model quasispin systems with positive and negative interaction. It is shown that the minimax principle [11] is valid in this case.

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