David Tong -- What is Quantum Field Theory?

Quantum Field Theory I - Lecture 1

Mathematically, what's the difference between the EM field in classical E&M and the EM field in QED? What mathematical properties does the QED version have that the classical version doesn't and vice

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Quantum Field Theory by David Tong

Quantum Field Theory - David Tong

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David Tong: Quantum Field Theory