一、题目:
On the chromatic number of a family of odd hole free graphs
二、主讲人:
许宝刚
三、摘要:
A hole is an induced cycle of length at least 4, and an odd hole is a hole of odd length. A full house is a graph composed by a vertex adjacent to both ends of an edge in K_4. Let H be the complement of a cycle on 7 vertices. Following the idea and proving technique of Chudnovsky et al, we prove that for (odd hole, full house)-free graph G,χ(G)≤ω(G)+1, and the equality holds if and only if ω(G)=3 and G has H as an induced subgraph. This is a joint work with Jialei Song.
四、主讲人简介:
许宝刚,博士,南京师范大学教授(博士生导师)。主持完成国家自然科学基金6项,参加国家自然科学基金重点项目2项。现主持国家自然科学基金重点项目1项。长期从事图的染色与划分问题的研究,在图的染色与划分方面做了一些有意义的工作,解决了由国际著名图论学家所提出的一系列猜想与问题。
五、邀请人:
颜谨 数学学院教授
六、时间:
12月1日(周四)16:00-17:00
七、地点:
腾讯会议
八、联系人:
颜谨,联系方式:13964055656
九、主办:
山东大学数学学院