Lecture 07 - Interactions. Dyson's formula

David Tong: Lectures on Quantum Field Theory Interactions. Dyson's formula and a first look at scattering. Pages 50-55. Full playlist can be found here - https://www.youtube.com/playlist?list=PLaNkJORnlhZlVkrpQVvCTVvGAMIlXL88Y These are videos of the lectures given at the Perimeter Institute PSI programme in 2009. The lectures follow the printed notes which are available on the main quantum field theory webpage. Here - http://www.damtp.cam.ac.uk/user/tong/qft.html