Geodesic
Critical-point singularities. I. The critical-point condition and the susceptibility
Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 1, pp. 111-124 
V. N. Plechko. Critical-point singularities. I. The critical-point condition and the susceptibility. Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 1, pp. 111-124. http://geodesic.mathdoc.fr/item/TMF_1981_46_1_a10/
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Equilibrium many-particle systems in the critical region are discussed. An order parameter is introduced as a quasiaverage defined in accordance with the method of N. N. Bogolynbov Jr. A generalized critical-point condition is formulated and special cases of it discussed. Rigorous expressions are obtained for the susceptibility in the disordered phase.

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