
AMS Sectional Meeting Program by Special Session
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1999 Spring Southeastern Section Meeting
Gainesville, FL, March 1213, 1999
Meeting #940
Associate secretaries: Robert J Daverman, AMS daverman@math.utk.edu
Special Session on Algebraic and Geometric Combinatorics

Friday March 12, 1999, 8:30 a.m.10:50 a.m.
Special Session on Algebraic and Geometric Combinatorics, I
Room 207, W. W. Little Hall Organizers: Andrew J. Vince, University of Florida vince@math.ufl.edu
Neil L. White, University of Florida white@math.ufl.edu

8:30 a.m.
Counting Points on Varieties over Finite Fields Related to a Conjecture of Kontsevich.
John R Stembridge*, University of Michigan
(9400587)

9:00 a.m.
Short rational functions .
Alexander Barvinok*, University of Michigan
(94005241)

9:30 a.m.
A Homotopy Equivalence for Set Partitions related to Liftings of $S_{n1}$modules to $S_n$.
Sheila Sundaram*, Danbury, CT
(9400584)

10:00 a.m.
The Hilbert Series of A Ladder Determinantal Ideal.
Ian P. Goulden, University of Waterloo,Waterloo,Ontario
Devadatta M. Kulkarni*, Oakland University, Rochester, Michigan
(94005276)

10:30 a.m.
Matroid automorphisms and symmetry groups.
Lori Fern, SUNY at Binghamton
Gary P Gordon*, Lafayette College
Jason Leasure, University of Texas
Sharon Pronchik, lmco
(9400559)

Friday March 12, 1999, 2:30 p.m.5:50 p.m.
Special Session on Algebraic and Geometric Combinatorics, II
Room 207, W. W. Little Hall Organizers: Andrew J. Vince, University of Florida vince@math.ufl.edu
Neil L. White, University of Florida white@math.ufl.edu

2:30 p.m.
Symplectic matroids the easy way.
Timothy Y Chow*, Tellabs Research Center
(94005143)

3:00 p.m.
Recognizing Schubert Cells.
Sergey Fomin*, M.I.T.
Andrei V Zelevinsky, Northeastern University
(94005190)

3:30 p.m.
Double Bruhat cells and groups generated by symplectic transvections.
Andrei V. Zelevinsky*, Northeastern University
(94005232)

4:00 p.m.
The singular locus of a Schubert variety.
Vesselin N. Gasharov*, Cornell University
(94005258)

4:30 p.m.
Boolean Term Orders and the Root System $B_n$.
Diane M Maclagan*, University of California, Berkeley
(94005310)

5:00 p.m.
Brownian motion in a Weyl chamber, noncolliding particles, and random matrices.
David J. Grabiner*, University of Michigan
(94060242)

5:30 p.m.
Index of parabolic subalgebras of $GL(n)$ and {\it meanders}.
Vladimir Dergachev*, University of Pennsylvania
Alexandre Kirillov, University of Pennsylvania
(94022140)

Saturday March 13, 1999, 8:00 a.m.10:50 a.m.
Special Session on Algebraic and Geometric Combinatorics, III
Room 207, W. W. Little Hall Organizers: Andrew J. Vince, University of Florida vince@math.ufl.edu
Neil L. White, University of Florida white@math.ufl.edu

8:00 a.m.
Inequalities for the ${\bf cd}$index.
Richard G. Ehrenborg*, Institute for Advanced Study
Louis J. Billera, Cornell University
(94005269)

8:30 a.m.
Interior faces of subdivisions of the simplex.
Margaret M Bayer*, University of Kansas
(94052168)

9:00 a.m.
A Topological Classification of Regular Polytopes.
Egon Schulte*, Northeastern University
(94051272)

9:30 a.m.
A space of tetrahedra .
Eric K Babson*, University of Washington
Paul Gunnells, Columbia University
Richard Scott, Santa Clara University
(94005360)

10:00 a.m.
Polytopal bundles.
Laura Anderson*, Texas A&M University
Nikolai Mnev, Steklov Institute
(94005354)

10:30 a.m.
Systems of parameters for cubical complexes.
Margaret A. Readdy*, Institute for Advanced Study
(94005224)

Saturday March 13, 1999, 2:30 p.m.5:20 p.m.
Special Session on Algebraic and Geometric Combinatorics, IV
Room 207, W. W. Little Hall Organizers: Andrew J. Vince, University of Florida vince@math.ufl.edu
Neil L. White, University of Florida white@math.ufl.edu

2:30 p.m.
The $k$consecutive Arrangements.
Bruce E. Sagan*, Department of Mathematics, Michigan State University, East Lansing, MI, 488241027
William Brockman, Department of Mathematics, Michigan State University, East Lansing, MI, 488241027
(9400525)

3:00 p.m.
A combinatorial proof of the logconcavity of the numbers of permutations with $k$ runs.
Mikl\'os B\'ona*, IAS
Richard Ehrenborg, IAS
(9400545)

3:30 p.m.
The intersection lattice of a discriminantal arrangement.
Christos A Athanasiadis*, Instructor
(94005111)

4:00 p.m.
Aztec dungeons and powers of 13.
Mihai A Ciucu*, Georgia Institute of Technology
(94005262)

4:30 p.m.
Graphical generalizations of the sieve formula.
Gabor Hetyei*, University of Kansas
(9400564)

5:00 p.m.
Pieri Operators on Posets.
Nantel Bergeron, York University
Stefan Mykytiuk, York University
Frank Sottile*, University of Wisconsin
Stephanie van Willigenburg, York University
(9400574)
Inquiries: meet@ams.org

