This site keeps track of the content of the Geometry I Course taught at the Technical University Berlin during winter term 2012/13. It is the first time that I try to create lively lecture notes this way and I hope that the students and myself will create great notes, discuss the content, and enjoy the final result.
The first thing you need to do is to register. Then you will be able to contribute your own thoughts and to comment on other peoples post. To register, please write an email to Emanuel (huhnen[at]math.tu-berlin.de) that contains your desired username (minimum 4 characters, only lower case letters and numbers) and the email address you want to use for the blog. We will then create your account and you will receive an invitation email to join the blog.