Research Seminar in Mathematics (MTH G450 - 30757)
Organized by Professor Jonathan Weitsman
Guest Speaker: Lauren Williams
Harvard University
Title: What does the non-negative part of a flag variety look like?
Date: Tuesday, April 7, 2009
Time: 3:30 p.m.
Location: 509 Lake Hall
Department tea (3:30-4:00)
Research Talk (4:00 - 5:00)
Abstract: In the 1990's, Lusztig generalized the classical theory of
total positivity, and in particular, defined the non-negative part of
any flag variety. It has been believed for some time that the
topology of these spaces should be very simple: that they should be
homeomorphic to closed balls. In this talk I will explain how to use
tools such as poset topology and discrete Morse theory to get a better
understanding of what these spaces look like. Part of this is joint
work with K. Rietsch.
Discussion at 5:00 p.m. followed by dinner with the speaker.
Previous Talks:
Fall 2008:9/16, 9/23, 10/07,10/28,11/18,12/02
Spring 2009:01-27,02-24,03/10
Started: 23 September 2008 Last modified: 31 March 2009
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