arXiv:hep-ph/9403399·v1·High Energy Physics — Phenomenology
Gauge invariance of massless QED
Michael Duetsch🇨🇭 · Tobias Hurth🇨🇭 · Guenter Scharf🇨🇭
Abstract
A simple general proof of gauge invariance in QED is given in the framework of causal perturbation theory. It illustrates a method which can also be used in non-abelian gauge theories.
Comments: 7 pages, TEX-file, Zuerich University Preprint ZU-TH-33/1993