应数学与统计学院的邀请，美国Delaware大学Sebastian M. Cioaba教授近期将访问我院，并做以下学术报告： 

        题目：Spectral characterization of graphs
        时间：2015年9月25日，4:30pm—5:30pm
        地点：理科楼407

        摘要： The eigenvalues of a graph give important information regarding its structure. In this talk, I will describe some joint work with Haemers, Vermette and Wong characterizing all graphs with all but 2 eigenvalues different than -1 and 1 and if there is time, some joint work with Brouwer, Haemers and Vermette involving the spectrum of simplicial graphs.

        报告人简介：Sebastian M. Cioaba is an associate professor in Department of Mathematical Sciences, University of Delaware, USA. He got his Ph.D. degree of Mathematics from Qeen’s University at Kingston, Ontariao, Canada. His main research interests include Discrete Mathematics, Algebra, Computer Science, and Probability. He has pulished over 40 papers in highly prestigious jounals such as Journal of Combinatorial Theory , Ser B, European Journal of Combinatorics, etc. He is also on Editorial board of several distinguised journals including Linear and Multilinear Algebra, Journal of Algebra Combinatocics and Discrete Structures and Applications.

        欢迎感兴趣的师生参加！