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[null,"1.","Record Nr.",null,"UNINA9910739419603321"]
[null,null,"Autore",null,"Milton Kimball A"]
[null,null,"Titolo",null,"Schwinger's Quantum Action Principle : From Dirac’s Formulation Through Feynman’s Path Integrals, the Schwinger-Keldysh Method, Quantum Field Theory, to Source Theory / / by Kimball A. Milton"]
[null,null,"Pubbl/distr/stampa",null,"Cham : , : Springer International Publishing : , : Imprint : Springer, , 2015"]
[null,null,"ISBN",null,"3-319-20128-X"]
[null,null,"Edizione",null,"[1st ed. 2015.]"]
[null,null,"Descrizione fisica",null,"1 online resource (122 p.)"]
[null,null,"Collana",null,"SpringerBriefs in Physics, , 2191-5423"]
[null,null,"Disciplina",null,"530.143"]
[null,null,"Soggetti",null,"Quantum theory"]
[{"$nulls":4},"Physics"]
[{"$nulls":4},"Mathematical physics"]
[{"$nulls":4},"Quantum Physics"]
[{"$nulls":4},"History and Philosophical Foundations of Physics"]
[{"$nulls":4},"Mathematical Applications in the Physical Sciences"]
[{"$nulls":4},"Mathematical Methods in Physics"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,null,"Note generali","Description based upon print version of record."]
[null,null,null,"Nota di bibliografia","Includes bibliographical references."]
[null,null,"Nota di contenuto",null,"Historical introduction -- Review of classical action principles -- Classical field theory - electrodynamics -- Quantum Action Principle -- Time-cycle or Schwinger-keldysh Formulation -- Relativistic Theory of Fields -- Nonrelativistic Source theory -- Concluding remarks."]
[null,null,null,"Sommario/riassunto","Starting from the earlier notions of stationary action principles, these tutorial notes shows how Schwinger’s Quantum Action Principle descended from Dirac’s formulation, which independently led Feynman to his path-integral formulation of quantum mechanics. Part I brings out in more detail the connection between the two formulations, and applications are discussed. Then, the Keldysh-Schwinger time-cycle method of extracting matrix elements is described. Part II will discuss the variational formulation of quantum electrodynamics and the development of source theory."]