题目：A Categorification of Subword Complexes and its Hall Algebra

报告人：李子骏，圣埃蒂安大学（Université Jean Monnet Saint-Étienne) 

时间：2026年1月7日（星期三）16: 00-17: 00

地点：东区第五教学楼5506教室

摘要：Subword complexes are combinatorial objects associated with words in Coxeter groups. In this talk, we give a categorification of subword complexes. The root-independent subcategory is proto-abelian, which allows us to define its Hall algebra.

As an application we show that the Hall algebra induced by a symmetry-breaking exact structure in type A_n categorizes the universal enveloping algebra and is closely related to quiver representations over F_1. 

报告人简介：李子骏，圣埃蒂安大学（Université Jean Monnet Saint-Étienne) 博士生二年级，中法数学英才班2019级/2023届学生。