AbstractMany important posets (partially ordered sets) in combinatorics have algebriac interpretations. We will go over three families of examples: toric varieties, Schubert varieties and matroid Schubert varieties. We will discuss how to translate some of the combinatorical invariants into the geometric ones, and the application of intersection cohomology groups in solving combinatorical probl...
Professor Alan David SokalUniversity College London, New York UniversityMy current research centers on topics at the interface between combinatorics and analysis. In particular, I am interested in novel and unexpected positivity properties that arise for some combinatorially defined polynomials and power series. Some of these properties are closely connected with the Stieltjes moment problem an...