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- W2023198760 abstract "Many-body problems can very seldom be solved exactly, and their study normally requires approximate methods1. These approximations are of various kinds and accuracy, but usually they involve either a perturbation treatment, or a variational approach. The method employed also depends on whether the problem under study is a real or realistic system (e.g. the ferromagnetism of the surface of the ordered FeCo alloy2; the photoemission spectrum of nickel metal3; the thermal energy gap4 of semiconducting Si) or a prototype, ideal model (e.g. the free-electron gas1,5,6; the one-dimensional Hubbard model7,8; the square-lattice Hubbard model9; the single-center Anderson impurity model10,11)." @default.
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- W2023198760 date "1988-01-01" @default.
- W2023198760 modified "2023-09-28" @default.
- W2023198760 title "A Periodic Small-Cluster Approach to Many-Body Problems" @default.
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- W2023198760 doi "https://doi.org/10.1007/978-1-4613-0973-4_28" @default.
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