Key points are not available for this paper at this time.
The static interaction between elementary particles can be introduced in the Hamiltonian by way of a contact transformation. In classical theory no serious difficulties arise. However, in quantum theory of radiation divergent terms appear.
E. C. G. Stueckelberg (Thu,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: