Introduction to
Quantum Field Theory

• Aspects of Classical Field Theory

These notes deal principally with the notion of symmetries in classical field theory. Noether's theorem is explained and proved in different ways. The inverse of Noether's theorem, or how to get from conserved charges to symmetries is also addressed. 

• Quantizing fermions

These notes describe a group theoretic way of getting to the Dirac equation and then discuss building the Dirac Lagrangian. Finally, fermions are quantized. 

• Quantum Electrodynamics

These notes describe the Routhian procedure of quantizing free electrodynamics and then putting in interactions to obtain QED in the same formulation.