Time
Nov 26, 18:00-22:00, 2017
Place
Math -101
Webpage
A night of mathematics and Jazz

All faculty and students are cordially invited.

#### Program

Barak Weiss, Tel Aviv University

The illumination problem

The following elementary problem in geometry is still open: given a polygon $P$ in the plane, say that points $x$ and $y$ in $P$ see each other if there is a billiard path from $x$ to $y$. Is there a polygon in which infinitely many pairs of points do not see each other?

Such problems turn out to be easy to state but very difficult to solve. I will explain this and related questions in greater detail, and describe some recent progress which relies on well-known work of Eskin and Mirzakhani (part of the late Maryam Mirzakhani’s Field medal citation).

##### 19:00 A Jazz show by Tsachik and the perverse sheaves

Ehud Ettun on bass

Haruka Yabuno on Piano

Tsachik Gelander on drums