数学与统计学院学术报告[2023] 056号
(高水平大学建设系列报告827号)
报告题目: Orientations of graphs avoiding given lists on out-degrees
报告人: 鲁红亮教授(西安交通大学)
报告时间:2023年8月3日(星期四)9:00-11:00
报告地址:汇文楼1420
报告摘要:Let G be a graph and be a set function. The graph G is said to be F-avoiding if there exists an orientation O of G such that for every , where denotes the out-degree of v in the directed graph G with respect to O. In this paper, give a Tutte-type good characterization to decide the F-avoiding problem when for every , and contains no two consecutive integers. Our proof also gives a simple polynomial algorithm to find a desired orientation. As a corollary, we prove the following result: if for every , and contains no two consecutive integers, then G is F-avoiding. This partly answers a problem proposed by Akbari et. al. (2020)
报告人简历:鲁红亮,2010博士毕业于南开大学,现任西安交通大学数学院教授,博士生导师,曾受邀于第九届全国组合数学与图论大会做一小时大会报告,2020年荣获“陕西省青年科技奖”。主要研究图的度约束因子与超图的匹配问题,解决了多个图因子及匹配研究领域的公开问题及猜想;已发表及接受发表论文六十余篇,多篇论文发表在Sci. China Math.、SIAM DM、JGT、JCTA、EJC等图论领域权威期刊上;共主持四项国家自然科学基金项目,其中三个面上项目,一个青年项目。
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邀请人:黄泽军
数学与统计学院
2023年7月31日