### January 19, Wednesday 14:15, Jacobs Building Room 303

** Title: Stabbing Simplices and Convex Sets**

**Lecturer :** Gabriel Nivasch

**Lecturer homepage
:** http://people.inf.ethz.ch/gnivasch/index.html

**Affiliation :** ETH Zurich

The "First Selection Lemma" states that for every n-point set S in R^d there exists a point x in R^d that intersects at least a constant fraction of the (n choose (d+1)) d-dimensional simplices spanned by S. The question is, what is the maximum value of this constant.