Q&A session 28/02

This week, Magdalena will wrap up our crash course in differential geometry. Before we get back to physics, and apply our new mathematical knowledge to derive Einstein's field equations, we will instead of a regular lecture have a Q&A session next Tuesday (28/02).  The idea is to take up any questions that you still have about this part of the course -- so the better you come prepared, the more you will get out of it!