报 告 人:韩杰 教授
报告题目:Dense uniform hypergraphs have zero or many perfect matchings
报告时间:2025年02月24日(周一)下午3:00
报告地点:静远楼1508会议室
主办单位:数学与统计学院、数学研究院、科学技术研究院
报告人简介:
韩杰,北京理工大学数学与统计学院教授,博导。研究图论与组合数学及计算机理论,超图中的子图问题。2015 年于美国佐治亚州立大学获博士学位,2018 年-2020 年于美国罗德岛大学任 tenure-track 助理教授,获美Simons Foundation 基金资助(2019-2024)。2021 年获国家高层次青年人才计划,加入北京理工大学数学与统计学院。在 Transactions of the American Mathematical Society 等杂志发表学术论文 60 余篇。
报告摘要:
Recently there has been exciting developments on the robust version of graph theory theorems. For hypergraph perfect matchings, it is shown by Pham-Sah-Sawhney-Simkin and Kang-Kelly-Kuhn-Osthus-Pfenninger that sufficiently large n-vertex k-uniform hypergraph with minimum codegree at least n 2 ⁄ have many perfect matchings. We present a refinement of this result in the following sense: sufficiently large n -vertex k -uniform hypergraph with minimum codegree siginificantly larger than n k ⁄ either has no perfect matching or many perfect matchings。