Geodesic
A model Hamiltonian of the BCS type for a Bose gas
Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 3, pp. 400-411 Cet article a éte moissonné depuis la source Math-Net.Ru

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A study is made of a model Hamiltonian of BCS type for a Bose gas and it is given a rigorous mathematieal meaning tn the ease of an infinite volume. The grand partition function is calculated and an equation of state is found, it is shown that in the ease of an infinite volume the chain of equations for the Green's functions has two solutions: free Green's funetions and Green's functions of the approximating Hamittonian. 
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     author = {V. P. Yatsishin},
     title = {A model {Hamiltonian} of the {BCS} type for a {Bose} gas},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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V. P. Yatsishin. A model Hamiltonian of the BCS type for a Bose gas. Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 3, pp. 400-411. http://geodesic.mathdoc.fr/item/TMF_1973_14_3_a10/

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