A nuclear potential based on meson field theory is obtained in analogy with the derivation of Breit interaetion between two electrons, as given by Ivanenko and Sokolov.In this treatment the meson field is not quantized. All the four type of the current meson field and their mixture can be treated in the same way. The result has been further reduced by expansion in the v/c of the nucleon, the zeroth-order potental being identical with the static potential previously obtained by Mller and Rosenfeld . The first-order poential will vanish if there is only one coupling constant for each type of meson field , in which case the expansion has been carried to the second order of v/c , retardation effects being also included. Many-body forces naturally appear.
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