Geodesic
Dyson equation for spin Green's functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 56 (1983) no. 1, pp. 149-153 
V. G. Bar'yakhtar; V. N. Krivoruchko; D. A. Yablonskii. Dyson equation for spin Green's functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 56 (1983) no. 1, pp. 149-153. http://geodesic.mathdoc.fr/item/TMF_1983_56_1_a14/
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is shown that Dyson's method for separating irreducible diagrams can be used in the diagram technique for spin operators. This method is used to obtain an equation for the transverse spin Green's function of a Heisenberg ferromagnet.

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