Ciro Santilli
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Path integral formulation | 🗖 nosplit | ↑ parent "Mathematical formulation of quantum field theory" | 61, 2, 92

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This one might actually be understandable! It is what Feymann starts to explain at: Richard Feynman Quantum Electrodynamics Lecture at University of Auckland (1979).
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The difficulty is then proving that the total probability remains at 1, and maybe causality is hard too.
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The path integral formulation can be seen as a generalization of the double-slit experiment to infinitely many slits.
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