Organizers: Laura Anderson, Vaidy Sivaraman, and Thomas Zaslavsky.

**Tuesday, January 27**

No meeting today. The Seminar is still preparing for the Spring Term.**Tuesday, February 3**

No meeting today. The Combinatorics Seminar suggests:

**Thursday, February 5**

**The Geometry/Topology Seminar***Speaker*: Ivan Izmestiev (Freie Universität Berlin)*Title*: Variational Properties of the Discrete Hilbert-Einstein Functional*Time*: 2:50 - 3:50*Room*: WH-100E**Tuesday, February 10***Speaker*: Vaidy Sivaraman (Binghamton)*Title*: The Joint Mathematics Meetings*Time*: 1:15 - 2:15*Room*: WH-100EI will reminisce about the Joint Mathematics Meetings of January, 2015.

**Tuesday, February 17 (joint with the Algebra Seminar)***Speaker*: Marcelo Aguiar (Cornell)*Title*: The Steinberg Torus and the Coxeter Complex of a Weyl Group*Time*: 1:15 - 2:15*Room*: WH-100E**Thursday, February 26 (joint with the Geometry/Topology and Algebra Seminars)****(Note special day.)***Speaker*: Eric Swartz (Western Australia)*Title*: Generalized Quadrangles With Symmetry*Time*: 2:50 - 3:50*Room*: WH-100EA generalized quadrangle is a point-line incidence geometry Q such that (1) any two points lie on at most one line, and (2) given a line l and a point P not incident with l, P is collinear with a unique point of l. Generalized quadrangles are a specific type of generalized polygon, which were first introduced by Tits in 1959 as geometries associated to classical groups. It is natural, then, to ask the question: if one starts with the abstract definition of a generalized quadrangle, which ones are highly symmetric? I will discuss the background of this question, leading to the following recent work, joint with John Bamberg and Cai-Heng Li.

An antiflag of a generalized quadrangle is a non-incident point-line pair (P, l). We say that the generalized quadrangle Q is antiflag-transitive if the group of collineations (automorphisms that send points to points and lines to lines) is transitive on the set of all antiflags. We prove that if a finite, thick generalized quadrangle Q is antiflag-transitive, then Q is one of the following: the unique generalized quadrangle of order (3,5), a classical generalized quadrangle, or a dual of one of these.

The talk will assume no prior knowledge of finite geometry.

**Tuesday, March 3***Speaker*:*Title*:*Time*: 1:15 - 2:15*Room*: WH-100E**Tuesday, March 10***Speaker*:*Title*:*Time*: 1:15 - 2:15*Room*: WH-100E**Tuesday, March 17***Speaker*:*Title*:*Time*: 1:15 - 2:15*Room*: WH-100E**Tuesday, March 24***Speaker*:*Title*:*Time*: 1:15 - 2:15*Room*: WH-100E-
Saturday, March 28
**DISCRETE MATHEMATICS DAY at Bard College**

There will be several talks, breakfast and lunch, and a chance to meet people, including our old friend Matt Beck. Highly recommended. Free registration beforehand helps them to plan the lunch. **Tuesday, March 31***Speaker*:*Title*:*Time*: 1:15 - 2:15*Room*: WH-100E

*Speaker*: Jim Lawrence (George Mason)

Past Semesters:

Fall 2014 | Spring-Summer 2014 | Fall 2013 | Spring-Summer 2013 | Fall 2012 | Spring 2012 | Fall 2011 | Spring-Summer 2011 | Fall 2010 | Spring-Summer 2010 | Fall 2009 | Spring-Summer 2009 | Fall 2008 | Spring 2008 | Fall 2007 | Spring 2007 | Fall 2006 | Spring 2006 | Fall 2005 | Spring 2005 | Fall 2004 | Spring 2004 | Fall 2003 | Spring 2003 | Fall 2002 | Spring 2002 | Fall 2001 | Spring 2001 | Fall 2000 | Spring 2000 | Fall 1999 | Spring 1999 | Fall 1998 |

Departmental home page.