A discussion of the unitary-model-operator approach to the correlation problem in nuclei is presented and some calculational detials are discussed. The renormalization of the tensor force is carried out in second-order perturbation theory after the introduction of a set of correlated basis functions. It is indicated that the application of the Hartree-Fock method to the resulting effective Hamiltonian extends the range of application of the theory for which a degree of self-consistency in the calculations may be achieved.

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