Wrong problem! Bad proofreading caused ¡­

Wrong problem! Bad proofreading caused an error in the problems for seminar week 3 (14-18 February). If you have looked at the problems already you will have seen that problem 2 was the same as problem 3 in week 2. A corrected version of the problem set, with a different problem 2, is now on the website. I'm sorry about the confusion this may have caused! Arne Str?m