The problems for the next exercise session and the videos for this week's lecture are available on Moodle under Module 2. Please note: (1) The problems are perhaps the hardest you will need to solve for the course. Don't despair if you cannot solve everything immediately. We will revisit them as much as needed. (2) Some of the videos refer to material that I actually skipped during lecture. Watch them if you are interested, but you will obviously not be examined on that. Thank you all for a very interactive lecture -- it was a pleasure.