A variational approach to the ground state of a many-fermion system is developed with the trial function of condensed pairs proposed by Blatt. The calculation of matrix elements is done by a diagrammatic method which is much simpler than Blatt's. The method is susceptible of generalization to higher correlations. It is also shown that the theory is identical with Hartree-Bogolyubov theory. The Hartree-Bogolyubov equations are derived from the variational point of view.
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Michel Baranger (1963) studied this question.
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