报告人：陈仪朝教授（苏州科技大学）

时间：2021/10/19, 10:00-11:00

地点：精正楼307

报告摘要：Given an Eulerian digraph, we consider the genus distribution of its face-oriented embeddings. We prove that such distribution is log-concave for several families of Eulerian digraphs, thus giving a positive answer for these families to a question asked in Bonnington, Conder and Morton (2002). The proof uses real-rooted polynomials and the representation theory of the symmetric group Sn. The result is also extended to some factorizations of the identity in Sn that are rotation systems of some families of constellations（与方文杰合作）.

报告人简介：陈仪朝，苏州科技大学99905银河在线登录平台教授，江苏省“双创人才”资助对象。2006年博士毕业于北京交通大学，师从刘彦佩教授，一直从事拓扑图论的研究，与J.Gross合作在图嵌入分布有系列深入的研究工作,10余次受邀在国际学术会议做邀请报告。 

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邀请人：白占强, 董超平