Abstract
We have traced Schwinger’s development of action formulations from classical systems of particles and fields, to the description of quantum dynamics through the Quantum Action Principle.
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One of Schwinger’s last publications (Schwinger 1993) described the centrality of Green’s functions to his life work.
Acknowledgments
I thank the Laboratoire Kastler Brossel, ENS, UPMC, CNRS, for its hospitality during the completion of the first part of manuscript. I especially thank Astrid Lambrecht and Serge Reynaud. The work was supported in part with funding from the Simons Foundation, CNRS, and the Julian Schwinger Foundation. I thank my many students at the University of Oklahoma, where much of the material reported here was used as the basis of lectures in electrodynamics, quantum mechanics, and quantum field theory. I especially thank Herb Fried for permission to use his transcription of Schwinger’s 1956 lectures as the basis for Chap. 6 here, and Walter Becker for his LaTeX conversion of those notes.
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Milton, K.A. (2015). Concluding Remarks. In: Schwinger's Quantum Action Principle. SpringerBriefs in Physics. Springer, Cham. https://doi.org/10.1007/978-3-319-20128-3_8
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DOI: https://doi.org/10.1007/978-3-319-20128-3_8
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