[Binghamton Geometry/Topology Seminar] March 17, joint w/ Combinatorics Seminar

[Marco Varisco]

BINGHAMTON GEOMETRY/TOPOLOGY SEMINAR
& COMBINATORICS SEMINAR
  http://www.math.binghamton.edu/dept/topsem/
  http://www.math.binghamton.edu/dept/ComboSem/

Date:  *Tuesday*, March 17, 2009

Time:  *1:15* pm

Place:  Library North 2205

Speaker:  Andy Fromader (Cornell University)

Title:  The Charney-Davis conjecture for certain spheres

Abstract:  The Charney-Davis conjecture is an easily stated linear
inequality on the face numbers of simplicial spheres that are also
flag complexes, that is, complexes for which every minimal non-face is
a two element set. While the conjecture is reasonably well known, it
is only known to hold in a handful of rather narrow cases, and the
proofs are often very complicated. I will discuss some known results
and give an easy proof of a relatively broad case.