【和山数学论坛第207期】西弗吉尼亚大学罗荣教授学术报告

信息来源:88858cc永利官网学院办公室   点击次数:  发布时间:2019-11-13

题目:Flows of signed graphs

主讲人:西弗吉尼亚大学  罗荣 教授

时间:201911月15日(五) 15:00~16:00

地点:A4-305

摘要

It was observed by Tutte that the problem of the face-coloring (map coloring)of a graph embedded on an orientable surface can be formulated in terms of integer flows of the graph. It was further extended by Bouchet (JCTB 1983) for graphs on non-orientable surfaces. For graphs embedded on non-orientable surfaces, the dual version of vertex-coloring is the flow problem for signed graphs. An edge is negative if it passes through an odd number of crosscaps. Bouchet (JCTB 1983) conjectured that every flow admissible signed graph admits a nowhere-zero 6-flow. In this talk, I will report the progresses we make toward Bouchet’s 6-flowo conjecture.


个人简介 罗荣,西弗吉尼亚大学数学系教授。 主要研究领域是图的染色和流理论。 发表60多篇论文。


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