THE FEYNMAN PATH INTEGRAL AND SCHWINGER'S ACTION PRINCIPLE
THE FEYNMAN PATH INTEGRAL AND SCHWINGER'S ACTION PRINCIPLE
This chapter provides a brief introduction to the basics of quantum field theory. The basic ideas of Feynman path integrals and Schwinger’s action principle, a knowledge of which is required to understand modern field theory, and the book are explained at a standard undergraduate quantum mechanics level.
Keywords: quantum theory, Feynman path integral, Schwinger’s action principle, field theory, quantum mechanics
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