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理学院春季第十二周学术报告(一)

发布时间:2018-05-16

学 术 报 告

 

报告题目:Nowhere-zero flows of signed graphs

 

报告学者:罗荣教授

 

报告者单位Department of Mathematics, West Virginia University,USA

 

报告时间2018年5月22日(星期四)下午4:30—5:30

 

报告地点学生活动中心十层1005-3

 

摘要 In 1983, Bouchet proposed a conjecture that every flow-admissible signed graph has a nowhere-zero 6-flow.The best published result is Zyka's 30-fow theorem and was recently improved to 12-flow by DeVos.Chen et al. further strengthened DeVos' result for bridgeless signed graphs, and show that every bridgeless flow-admissible signed graphadmits a nowhere-zero 11-flow.  In this talk I will give a survey  and present some new results on flows of signed graphs. 

 
报告人简介 罗荣,美国西弗吉尼亚大学(West Virginia University,USA)数学系教授。主要研究图的染色理论和流的理论,是国际知名的染色问题专家。在 Journal of Cominatorial Theory Ser. B, Journal of Graph Theory,  SIAM Journal on Discrete Math,  European J. of Combinatorics 等杂志上发表近60篇论。
 

主办教师:郝荣霞

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