Expanded notes

At the request of some students, I have added a large appendix on gamma-matrices and their representations, discrete symmetries of the Dirac equation, Majorana and Weyl spinors and corresponding representations etc. I consider all this to be part of QFT I. The expanded notes have been uploaded. All the errors that people have pointed out so far, have been corrected (but there could always be new errors, so please keep looking!).

In particular I have explained the principles behind each of the gamma-matrix representations and provided a method to construct and verify each class of representations from first principles. For some reason most textbooks don't really explain this, so I hope this material will be useful.