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The information which is contained in an averaged form in the first-order reduced density matrix is sufficient to build a close approximation to the second-order reduced density matrix and consequently to the system energy. This is achieved by using the anticommutating relation of fermion operators and the commutating relation of the pair-of-fermions operators. Three test calculations are reported and analyzed.
Physical Review A – American Physical Society (APS)
Published: Apr 1, 1992
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