Geodesic
On manifolds of phase coexistence
Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 40-47 
D. Ruelle. On manifolds of phase coexistence. Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 40-47. http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a5/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Using a theorem on convex functions due to Israel, it is shown that a point of coexistence of $n+1$ phases cannot be isolated in the space of interactions, but lies on some “infinite dimensional manifold”.

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[2] S. A. Pirogov, Ya. G. Sinai, Funkts. analiz i ego prilozh., 8:1 (1974), 25 | MR

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[4] S. A. Pirogov, Ya. G. Sinai, TMF, 25 (1975), 358 ; 26 (1976), 61 | MR | MR

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[6] D. Ryuel, Statisticheskaya mekhanika. Strogie rezultaty, «Mir», 1971

[7] R. B. Griffiths, D. Ruelle, Commun. Math. Phys., 23 (1971), 169 | DOI | MR