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...
Speaker报告人牟浪(University of California,Davis)Time时间Mon., 15:30-16:30, Sept. 8, 2025Venue地点B627, Shuangqing Complex Building AAbstract摘要I will present a manifestly positive formula computing any wall-function in a rank-2 scattering diagram generated by two initial lines. The coefficients of these wall-functions enumerate partial tilings of the region above certain Dyck paths. By lif...