On synthetic flag varieties

Sergey Fomin

University of Michigan

December 1,
4:15pm
refreshments at 3:45pm
2-338

ABSTRACT 

The Bruhat order of the symmetric group describes adjacency of Schubert cells in the complex flag manifold. This geometric model does not, however, explain the phenomenon discovered by A.Bjorner in the early 1980s: each interval in the Bruhat order (in fact, of any Coxeter group) is the face poset of some regular cell complex. I will report on recent progress on the problem, posed by Bjorner, of finding natural geometric realization of this complex. This is joint project in progress with Michael Shapiro (KTH Stockholm).


Speaker's Contact Info: fomin(at-sign)math.lsa.umich.edu


Return to seminar home page

Combinatorics Seminar, Mathematics Department, MIT, sara(at-sign)math.mit.edu

Page loaded on November 01, 1999 at 09:54 AM. Copyright © 1998-99, Sara C. Billey. All rights reserved.