Geodesic
Connection between the approximating Hamiltonian method and theta-function integration
Teoretičeskaâ i matematičeskaâ fizika, Tome 58 (1984) no. 1, pp. 61-71 Cet article a éte moissonné depuis la source Math-Net.Ru

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For the Fröhlich Hamiltonian describing the coupling of electrons to a countable set of phonon modes it is shown that the self-consistency equations which arise in the approximating Hamiltonian method can be solved by theta-function integration. 
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     title = {Connection between the approximating {Hamiltonian} method and theta-function integration},
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E. D. Belokolos; D. Ya. Petrina. Connection between the approximating Hamiltonian method and theta-function integration. Teoretičeskaâ i matematičeskaâ fizika, Tome 58 (1984) no. 1, pp. 61-71. http://geodesic.mathdoc.fr/item/TMF_1984_58_1_a4/

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