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Published in last 50 years
Using the numerical input the first orders of the perturbative expansion, we compute the ground state energy of the anharmonic oscillator in the infinite coupling limit.
An exact solution for the one-dimensional doubly degenerate Hubbard model is obtained for the case of N+1 electrons in the limit of infinite coupling (U and J to infinity ). The density of states, conductivity, susceptibility and specific heat are calculated. The results are very different from that of the non-degenerate Hubbard chain due to degeneracy.