Characterizing the extremal graphs with respect to the eccentricity eigenvalues, and beyond
主 讲 人 :?李书超 教授
活动时间:12月11日19时30分
地 点 :腾讯会议(会议ID: ID:493316505,密码2513)
讲座内容:
Given a graph G, the eccentricity matrix e(G) is constructed from the distancematrix of G by keeping only the largest nonzero elements for each row and eachcolumn and leaving zeros for the remaining ones. In this talk we first focus on someelementary and non-trivial properties on this novel matrix. Then wecharacterize the extremal graphs with respect to the eccentricity eigenvalues(including the largest and smallest eigenvalues). As a consequence, we solve two conjecturesproposed by Wang et al. (2018).
主讲人介绍:
李书超,华中师范大学数学与统计学学院教授、博士生导师。研究方向是组合数学、图论及其应用。先后在European Journal ofCombinatorics, Journal of Algebraic Combinatorics, Journal of CombinatorialDesigns、Journal of Combinatorial Optimization等国际SCI期刊发表学术论文100余篇,主持、参与国家自然科学基金多项。 2012主持完成的项目“图的几类重要不变量研究”获湖北省自然科学奖;2013年入选“教育部新世纪优秀人才支持计划”。
发布时间:2020-12-10 11:04:08