arXiv:math/0402223v2 [math.DG] 17 Jan 2006 L e c t u r e s A n o d n r e K i M ¨a h o r l o e i r a n G u e o m e t r y These lecture notes, based on a graduate course given by the author at Hamburg University in the Autumn of 2003, were withdrawn from the preprint server because of copyright constraints. They will be available soon as graduate textbook. Paris, January 2006