The variational principle for the energy is used to derive integrodifferential equations for the two-body functions which, when combined in the product form, yield the "best" independent-pair wave function for the a particle. A practicable iteration procedure for finding approximate solutions to these equations is developed and is used to obtain an approximate ground-state wave function, for an example, four-bodyHamiltonian for which the potential is central. Improvements in the iteration procedure are described which make it a feasible method for solving the integrodifferential equations even when tensor forces are included.
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