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Double perturbation theory and symmetry |
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| Authors: | A.T. Amos J.A. Yoffe |
| Affiliation: | Department of Mathematics, University of Nottingham, UK |
| Abstract: | A formulation of double perturbation theory is described which allows symmetry to be included in those cases where the zero-order hamiltonian does not contain the full symmetry of the problem. As an example we apply the theory to the Epstein-Johnson spin model. |
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