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图与组合系列讲座

  发布日期:2017-06-01  浏览量:649


               图与组合系列讲座之九

报告题目:  Median Eigenvalues and Graph Inverse

叶东(美国中田纳西大学, 助理教授)

报告时间:  201765(周一)上午9:30-10:30

报告地点: 磬苑校区澳门赌搏网站大全H306

报告摘要Let (G, w) be a weighted graph with a weight-function w: E(G) . A weighted graph (G, w) is invertible to a new weighted graph if its adjacency matrix is invertible. Graph inverse has combinatorial interest and can be applied to bound median eigenvalues of a graph such as have physical meanings in Quatumn Chemistry. In this talk, we will discuss characterization of inverse of a given weighted graph and methods to bound median eigenvalues.

 

专家概况: Dr. Dong Ye is an assistant professor of Department of Mathematical Sciences and Center for Computational Sciences of Middle Tennessee State University. He received his PhD from West Virginia University in 2012. His research interest mainly lies in Graph Theory and Combinatorics, particularly, cycle covers, perfect matchings, topological and algebraic properties of graphs. He published over 30 papers in professional journals such as Combinatorica, Discrete & Computational Geometry, European Journal of Combinatorics etc.

 

                图与组合系列讲座之十

 

报告题目:  On Circular Flow Conjecture

: 吴叶舟(浙江大学)

报告时间:  201765(周一)上午10:30-11:30

报告地点: 磬苑校区澳门赌搏网站大全H306

报告摘要Tuttes 3-Flow Conjecture and 5-Flow Conjecture are two kernel problems of graph theory.  Jeager generalized those two conjectures to a stronger one, known as the Circular Flow Conjecture, which says that, for every natural number p, every 4p-edge-connected graph admits a nowhere-zero (2 + 1/p)-flow. In this talk, we introduce some relative results on Circular Flow Conjecture.

 

专家概况: 吴叶舟,浙江大学海洋学院传感与网络研究所讲师。2003年于中国科技大学获学士学位,2006年于中国科技大学获硕士学位,导师为徐俊明教授,20071月至20127月于美国西弗吉尼亚大学数学系攻读博士学位,师从张存铨教授;20127月至20146月在香港大学数学系做博士后研究,合作导师为臧文安教授;2014年入职浙江大学海洋学院。 主要研究领域为图论中的流理论和圈覆盖问题。在Journal of Combinatorial Theory B SIAM Discrete MathematicEuropean Journal of Combinatorics等期刊上发表论文十余篇, 现主持国家自然科学基金一项。

 

欢迎各位老师、同学届时前往!

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