这是群论和图论方向的线上系列报告,我们希望能够促进国内外青年学者(博士生为主)在群论和图论研究上的交流。报告主题分布在(但不限于)以下研究方向:

- 有限单群(有限单群分类定理,子群结构,共轭类等)
- 置换群及其在组合结构上的作用
- 线性代数群与李型群
- 有限群的表示
- 有限\(p\)-群
- 图的谱理论

This is a platform for young group theorists and graph theorists (mostly PhD students) to talk about their research and related topics online. The topic can be anything related to group theory and graph theory, including but not limited to the following.

- Finite simple groups (CFSG, subgroup structures and conjugacy classes)
- Permutation groups and their actions on combinatorial structures
- Linear algebraic groups and Lie type groups
- Representations of finite groups
- Finite \(p\)-groups
- Spectral theory of graphs


Time

一般地,系列报告定期于北京时间每周三下午16:00-17:00进行。

Our usual time is Wednesday 16:00-17:00 (GMT+8).


Forthcoming Seminars

October 9th: Marco Barbieri (University of Pavia & University of Milano-Bicocca)
Vertex-transitive graphs and derangements
Zoom 616 601 4311 (passcode: gts2024)
October 23rd: 谢贻林 Yilin Xie (SUSTech)
Zoom 856 490 7913 (passcode: gtseminar)

The Next Seminar

Title: Vertex-transitive graphs and derangements

Speaker: Marco Barbieri (University of Pavia & University of Milano-Bicocca)

Time: 16:00-17:00 (GMT+8), Wednesday October 9th

Location: Zoom: 616 601 4311 (passcode: gts2024)

Abstract: A derangement is a permutation without any fixed points. An outstanding property of derangements in a finite transitive permutation group is their abundance. What can we say about the portion of derangements of a group acting transitively on the vertices of a graph? In the present talk, we will introduce a lower bound on the portion of derangements depending only on the valency of the graph, and we will discuss its asymptotic behaviour compared to other general lower bounds.

Other Confirmed Speakers

Jiaping Lu (University of St Andrews)

Current Organizers

陈俊彦 Junyan Chen (SUSTech)
丁兆宸 Zhaochen Ding (University of Auckland)
黄弘毅 Hong Yi Huang (University of Bristol)
尹富纲 Fu-Gang Yin (Central South University)

The seminar is currently based at the Southern University of Science and Technology (SUSTech, 南方科技大学).