We describe external electromagnetic fields for which a consistent QED nonperturbative with respect to these fields can be formulated. We point out difficulties with such a formulation in the case of the external Coulomb field.
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Translated from Ivvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 5–10, November, 2016.
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Gitman, D.M., Gavrilov, S.P. QFT Treatment of Processes in Strong External Backgrounds. Russ Phys J 59, 1723–1730 (2017). https://doi.org/10.1007/s11182-017-0969-y
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DOI: https://doi.org/10.1007/s11182-017-0969-y