- 0 will be gauge invariant.

Rev. Lett. 3, 351 (1959). 15. 1V1. GELL-MANN, F. Low, Phys. Rev. 95, 1300 (1954). e. ) so that we have now J I, U·(t Texp i 1. t(x)lin)sleo=o. aeo eo=O N If we now take our previous form (9) for V we see, that we can produce this ex- pression by functional derivation: +00 + bjl-'(X)b;A/(X) V = ~eo (outl T (jl-'(X) AI-'(x) expi - J 00 Ls(x) d 4 X) lin)i = ·f·· 46 H. MITTER: Now this can be transformed back to the Heisenberg picture, using (10) "j. l(x) lin)s, j. le(x) eo =0 . For the higher derivatives we can proceed in the same way.

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Quantum Electrodynamics: Proceedings of the IV. Internationale Universitätswochen für Kernphysik 1965 der Karl-Franzens-Universität Graz, at Schladming (Steiermark, Austria) 25th February–10th March 1965 (Acta Physica Austriaca / Supplementum II) by P. Urban (auth.), Paul Urban (eds.)

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