Dear students, I will not be able to come to Trieste today due to the flu. However, you must meet anyway to work on R&D4. You can do this in our classroom or wherever you wish. You will all be considered "attending" today (so please indicate "none" in the "absentees" box by default). Please find attached the text of the R&D. You have until 5 p.m. to send me your work. Good luck and see you next Monday. Don't miss it because we have two important guests and I will not tolerate absences