Title: How can we classify line arrangements on the plane?
Abstract: Suppose you want to draw n lines on the plane. In how many different ways could you do that? There are many possible ways in which the lines could intersect, and so as n increases, this question becomes an extremely difficult combinatorial problem.
In this talk I will present a specific number that is sometimes uses to classify line arrangements. We will see some of its properties, some of its applications, and also some of the questions that still remain open.
Coffee available 5pm in Hamilton Hall – 216 (Lounge)