Problem set 1

I just uploaded the first exercise sheet, such that you can get some hands-on training. Problem 1 is something based on your QFT 1 lecture ¨C and very useful in order to remind yourself both of conceptual aspects and of calculational steps that typically appear (not only) in canonical quantization. Problems 2 & 3 are a training in rate calculations (cross sections and lifetimes/decay rates) -- you'll need these skills a lot in this course, not just theoretically but also to be able to use Feynman rules etc in an efficient way.