Tamm-Dancoff Methods and Nuclear Forces

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Abstract
It is shown that by the use of 3-dimensional Feynman diagrams an equal-time two-particle wave equation can be written down. The procedure is the same one as Bethe and Salpeter used in deriving the 4-dimensional two-body equation. In this way all the terms of the new Tamm-Dancoff method of Dyson, in the form of the Lévy-Klein expansion of the interaction function, can easily be recorded.