Abstract
We suggest that Pauli-principle violations, which automatically occur within approximations in many body calculations for strongly correlated electron systems, are the cause for well known pathologies at low temperatures. As an example, the ( 1/N) expansion, where N denotes the degree of degeneracy of the f-level in Anderson's impurity model, is carried out without Pauli-principle violations. The preliminary result shows that the energy shifts due to the hybridization, which are characteristic for slave boson mean-field theories, are contained in the present approach.
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