Phys. Rev. D 64, 045011 (2001) [5 pages]QED in external fields: A functional point of viewReceived 26 January 2001; published 26 July 2001 A functional partial differential equation is set for the proper graphs generating functionals of QED in external electromagnetic fields. This equation leads to the evolution of the proper graphs with the external field amplitude and the external field gauge dependence of the complete fermion propagator and vertex is derived nonperturbatively. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.64.045011
DOI:
10.1103/PhysRevD.64.045011
PACS:
12.20.-m
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