On December 14, 2021, Tuan Tran from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on sufficient conditions for balls in a metric space to have small intersection and their applications. The title of his talk was “Exponential decay of intersection volume with applications on list-decodability and sphere-covering bounds“.

## Tuan Tran gave a talk on the minimum saturated families of sets at the Discrete Math Seminar

On January 26, 2021, Tuan Tran from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on a result towards the conjecture of Erdős and Kleitman on the size of an s-saturated family of subsets of {1,2,…,n}. The title of his talk was “Minimum saturated families of sets“.

## 2020 Combinatorics Workshop (2020 조합론 학술대회) was held on August 24 online

On August 24, Monday, the 2020 Combinatorics Workshop (2020 조합론 학술대회) was held online due to the COVID-19 pandemic. This local workshop series began in 2004 and has been continued to be one of the biggest annual gathering of people in combinatorics located in Korea. Due to the COVID-19 pandemic, it has been reduced to a one-day online conference on Zoom. It was hosted by Kyung Hee University and IBS Discrete Mathematics Group.

The workshop website: https://cw2020.combinatorics.kr

## There were 5 invited speakers.

**Sejeong Bang (방세정)**, Yeungnam University,*Geometric distance-regular graphs***Ringi Kim (김린기)**, KAIST,*Decomposing planar graphs into graphs with degree restrictions***Sangwook Kim (김상욱)**, Chonnam National University,*Combinatorics of lattice path matroid polytopes***Jinyoung Park (박진영)**, Institute for Advanced Study,*Tuza’s Conjecture for random graphs***Jongyook Park (박종육)**, Kyungpook National University,*On distance-regular graphs with induced subgraphs $K_{r,t}$*

## There were 4 contributed talks.

**Byung-Hak Hwang (황병학)**, Seoul National University,*Acyclic orientation polynomials***Jaeseong Oh (오재성)**, Seoul National University,*On linearization coefficients of q-Laguerre polynomials***Jun Seok Oh (오준석)**, Incheon National University,*An inverse Erdős-Ginzburg-Ziv theorem for finite groups***Tuan Tran**, IBS Discrete Mathematics Group,*The singularity of random combinatorial matrices*

## Tuan Tran gave a talk on the anti-concentration phenomena at the Discrete Math Seminar

On August 18, 2020, Tuan Tran from IBS Discrete Mathematics Group gave a talk on the anti-concentration phenomena and its consequences to the random matrix theory. The title of his talk is “Anti-concentration phenomena”.

## Welcome Ben Lund and Tuan Tran, new research fellows in the IBS Discrete Mathematics Group

The IBS discrete mathematics group welcomes Dr. **Ben Lund** and Dr. **Tuan Tran**, new research fellows at the IBS discrete mathematics group from August 1, 2020.

**Ben Lund** received his Ph.D. from the Department of Mathematics at Rutgers University in 2017 under the supervision of Prof. Shubhangi Saraf. Before joining the IBS, he was a postdoc at Princeton University and a postdoc at the University of Georgia.

**Tuan Tran** received his Ph.D. from the Department of Mathematics at the Freie Universität Berlin in 2015 under the supervision of Prof. Tibor Szabó. Before joining the IBS, he was a lecturer at Hanoi University of Science and Technology, a postdoc at ETH Zürich, and a postdoc at Czech Academy of Sciences. He won the IBS Young Scientist Fellowship.