报告题目：Homology and homotopy of finite graphs

报告人: Prof. Alexander Grigor'yan (University of Bielefeld, Germany)

时间: 2014年12月3日（星期三）16:00-17:00

地点:理科楼数学系A304

摘要: We introduce the notions of homology and homotopy for digraphs (directed graphs) and present their basic properties. In particular, homology groups are homotopy invariant, and the first homology group is abelization of the fundamental group.

联系人：胡家信