# Günter M. Ziegler

Günter M. Ziegler is a professor at the Freie Universität, Berlin. His interests are in connection of Discrete and Computational Geometry (especially polytopes), algebraic and topological methods in Combinatorics, Discrete Mathematics and the theory of Linear and Integer Programming. He received numerous prizes, among them the 2001 Leibniz Prize for his research and the Communicator Award in 2008, when he was a co-organizer of the "Year of Mathematics" in Germany. His writing includes Proofs from THE BOOK, which has been published in 14 different languages by now. |

**"Five Math Girls and their Images":** As we all know, a picture is worth a thousand words. And indeed, "what is the use of a book without pictures or conversations?" asks a little girl in a famous children's book written by a not-so-famous mathematician. My plan for this lecture is to show you at least five pictures, and to accompany this with more than five-hundred words.

**New Proofs for THE BOOK":** According to a legend told by Paul Erdös, God maintains a book, called THE BOOK, which contains perfect mathematical proofs. Martin Aigner and I have, some twenty years ago, started to collect examples, and then made some modest suggestions of proofs that might be in THE BOOK. In this lecture, I will try to present some more.