时间：2022年6月23日（星期四）16:00-17:00
地点：ZOOM
ZOOM会议号：867 9822 9963
密码：454119
主持人：西湖大学理论开云app官网下载安卓 院 古星博士
主讲人：西交利物浦大学 刘晔博士
报告题目：A categorial study of graph colorings
主讲人简介：
Dr. Ye Liu obtained his PhD from Hokkaido University in 2016. Now he is an assistant professor at Xi'an Jiaotong-Liverpool University. His research interest is the mathematics around hyperplane arrangements, especially related topology and combinatorics.
报告摘要:
The chromatic polynomial of a finite simple graph is one of the most important invariants of the graph. Using the concept combinatorial species by Joyal, we introduce a categorification of chromatic polynomial, called chromatic species. After presenting a formula of the chromatic species up to categorial equivalence in terms of stable partitions of the graph, we discuss some new enumerative results as well as some further questions. Joint work with Masahiko Yoshinaga (Osaka University).
