Abstract
It is shown that the coupled-cluster theory can be interpreted as an application of the similarity-transformation theory for the quantum-mechanical eigenvalue problem. The transformed Hamiltonian H = e #75T He T is introduced with the cluster operator T. The Hamiltonian H is expanded into different clusters according to the number of interacting particles. The n-body part of the cluster operator T is determined from the condition that the n-body part of H should be decoupled between two n-body states with configurations of n occupied and n unoccupied orbits
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