Abstract
The method of Tamm and Dancoff, for the non-adiabatic treatment of the relativistic interaction of two nucleons, is generalized in order to include nucleon pair creation and higher order effects in the exchange of mesons. This generalized form of the Tamm-Dancoff method is shown to give results which are equivalent to those obtained from the relativistic equation of Bethe and Salpeter. A detailed study is made of two limiting cases: (a) no pair of nucleons is created in the intermediate states, but an arbitrary number of mesons can be present at the same time; (b) the maximum number of mesons present at a given time is one, but the number of pairs is unrestricted.

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