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The FeynmanDyson theory is extended so as to include the scattering involving composite particles. For this purpose we have clarified the relation of the Salpeter.Bethe wave functions to the probability amplitude by introducing co-and contravariant components of state vectors keeping a close correspondence to the vector analysis in an ~blique coordinate system. ( 1).
Kazuhiko Nishijima (Sun,) studied this question.