Seminar Calendar
for events the day of Friday, August 10, 2012.

     .
events for the
events containing  

(Requires a password.)
More information on this calendar program is available.
Questions regarding events or the calendar should be directed to Tori Corkery. 
      July 2012             August 2012           September 2012   
 Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
  1  2  3  4  5  6  7             1  2  3  4                      1
  8  9 10 11 12 13 14    5  6  7  8  9 10 11    2  3  4  5  6  7  8
 15 16 17 18 19 20 21   12 13 14 15 16 17 18    9 10 11 12 13 14 15
 22 23 24 25 26 27 28   19 20 21 22 23 24 25   16 17 18 19 20 21 22
 29 30 31               26 27 28 29 30 31      23 24 25 26 27 28 29
                                               30

Friday, August 10, 2012

Algebra, Geometry and Combinatoric
2:00 pm   in 143 Altgeld Hall,  Friday, August 10, 2012
 Del 
 Edit 
 Copy 
Submitted by ayong.
Alexander Woo (Univ. of Idaho)
Local complete intersection Schubert varieties
Abstract: I will talk about a characterization of the Schubert varieties which are local complete intersections (lci) using pattern avoidance.  One direction of the proof is by constructing an explicit minimal set of equations cutting out neighborhoods of Schubert varieties at the identity.  This leads to some interesting combinatorics involving Fulton's essential set and the Schubert varieties defined by inclusions, which have a mysterious link to certain hyperplane arrangements called inversion arrangements.  The other direction requires a generalization of pattern avoidance known as mesh pattern avoidance. This is joint work with Henning Ulfarsson (Reykjavik U.).