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Model BCS Hamiltonian and Approximating Hamiltonian in the Case of Infinite Volume. IV. Two Branches of Their Common Spectra and States

We consider the model and approximating Hamiltonians directly in the case of infinite volume. We show that each of these Hamiltonians has two branches of the spectrum and two systems of eigenvectors, which represent excitations of the ground states of the model and approximating Hamiltonians as well...

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Bibliographic Details
Date:	2003
Main Authors:	Petrina, D. Ya., Петрина, Д. Я.
Format:	Article
Language:	English
Published:	Institute of Mathematics, NAS of Ukraine 2003
Online Access:	https://umj.imath.kiev.ua/index.php/umj/article/view/3899
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Journal Title:	Ukrains’kyi Matematychnyi Zhurnal
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