Some considerations on Ueff values enter
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J. Friedel; C. Noguera
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Article
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1983
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John Wiley and Sons
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English
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## Abstract One of the simplest ways to take into account correlations between electrons in solid state physics, beyond the usual one electron approximation, is to use the Hubbard Hamiltonian Although it corresponds to very severe approximations, since intersite correlations are neglected, and si