Summary
A simple derivation of the Gell-Mann-Low and Callan-Symanzik equations in finite QED is given. We control the corrections depending on the electron mass.
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Scharf, G. Renormalization group in finite QED. Nuov Cim A 107, 1427–1432 (1994). https://doi.org/10.1007/BF02775783
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DOI: https://doi.org/10.1007/BF02775783