Geodesic
On unordered phases of certain models on a Cayley tree
Sbornik. Mathematics, Tome 190 (1999) no. 2, pp. 193-203 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider the Ising model with several spin values, the Potts model, and the inhomogeneous Ising model. For each model we prove sufficiency conditions for extremality of the unordered phase. 
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N. N. Ganikhodzhaev; U. A. Rozikov. On unordered phases of certain models on a Cayley tree. Sbornik. Mathematics, Tome 190 (1999) no. 2, pp. 193-203. http://geodesic.mathdoc.fr/item/SM_1999_190_2_a1/

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