Summary
The difficulties of the supplementary condition are completely analogous to those of the momentum of the centre of mass in non-relativistic bound-state problems. It is unnecessary to introduce an indefinite metric or limiting procedures.
Riassunto
Nei problemi non relativistici degli stati legati le difficoltà della condizione supplementare sono del tutto analoghe a quelle dell’impulso del centro di massa. Non è necessario introduire una metrica indefinita o procedimenti di limite.
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References
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Candlin, D.J. The supplementary condition in quantum electrodynamics. Nuovo Cim 12, 54–62 (1959). https://doi.org/10.1007/BF02747806
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DOI: https://doi.org/10.1007/BF02747806