EAN: 9783319201276

Bilder-Quelle: discount24.de - Sport-Freizeit

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.

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04.05.2025 um 07:09 Uhr

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