Approximation of Green's functions |
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| Authors: | F Beck Dr B Fuchssteiner |
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| Institution: | 1. Institut für Theoretische Kernphysik der Technischen Hochschule, Darmstadt
2. Mathematisches Institut Technische Hochschule Darmstadt, Hochschulstra?e 1, D-6100, Darmstadt
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| Abstract: | Special symmetries of the Green's functions of a non-relativistic many fermion-system and conservation laws, expressible by hermitian generators, are formulated as relations for a Green's function operator. Approximations for the Green's functions, defined as partial summations of the perturbation expansion, and consistent with the symmetries and conservation laws are presented. |
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