Titlebook: Quantum Field Theory: Perspective and Prospective; Cécile DeWitt-Morette,Jean-Bernard Zuber Book 1999 Springer Science+Business Media Dord

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Correlation Functions Through Variational Methods,mion systems not only to the static and dynamic Hartree-Fock approximations, but provides for the correlations and for the two-time functions expressions which involve the static and dynamic RPA kernels, which thus acquire a variational status. The approximation satisfies many consistency requirements.