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Structure of essential spectrum and discrete spectrum of the energy operator of five-electron systems in the Hubbard model – doublet states. (English) Zbl 1480.81060

Kusraev, Anatoly G. (ed.) et al., Operator theory and differential equations. Selected papers based on the presentations at the 15th conference on order analysis and related problems of mathematical modeling, Vladikavkaz, Russia, July 15–20, 2019. Cham: Birkhäuser. Trends Math., 275-301 (2021).
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