Soon after the discovery of quantum mechanics the problem arose of extending it to the case of the electromagnetic field. It is a case where the extension is not obvious because the electromagnetic field, essentially, is a system with infinite degrees of freedom.

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Sixth Lecture New Developments in Quantum Electrodynamics

  • Enrico Fermi

摘要

Soon after the discovery of quantum mechanics the problem arose of extending it to the case of the electromagnetic field. It is a case where the extension is not obvious because the electromagnetic field, essentially, is a system with infinite degrees of freedom.