On February 14, 2024, Sebastian Wiederrecht from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar, showing that the even directed cycles have the 1/4-integral Erdős-Pósa property. The title of his talk was “Packing even directed circuits quarter-integrally“.

## Ander Lamaison gave a talk on the uniform Turán density of a hypergraph at the Discrete Math Seminar

On February 6, 2024, Ander Lamaison from the IBS Extremal Combinatorics and Probability Group gave a talk at the Discrete Math Seminar on the uniform Turán density of a hypergraph. The title of his talk is “Uniform Turán density beyond 3-graphs“.

## Welcome Prof. Andreas Holmsen from KAIST, a new Visiting Research Fellow in the IBS Discrete Mathematics Group

The IBS Discrete Mathematics Group welcomes Prof. Andreas Holmsen from the Department of Mathematical Sciences, KAIST, Daejeon, Korea. He will visit the IBS Discrete Mathematics Group for 1 year from February 1, 2024 during his sabbatical leave from KAIST. He received his Ph.D. from the University of Bergen in 2004 under the supervision of Prof. Helge Tverberg and was at the University of Bergen, New York University, City College of New York before coming to KAIST.

## Zichao Dong gave a talk on a variation of the Erdős-Szekeres problem among points of bounded pairwise distances at the Discrete Math Seminar

On January 23, 2024, Zichao Dong from the IBS Extremal Combinatorics and Probability Group gave a talk at the Discrete Math Seminar on a d-dimensional analog of a variation of the Erdős-Szekeres problem among n points of bounded pairwise distances. The title of his talk was “Convex polytopes in non-elongated point sets in R^d“.

## Matthew Kroeker gave a talk on the average number of points on affine subspaces determined by points at the Discrete Math Seminar

On January 16, 2024, Matthew Kroeker from the University of Waterloo gave a talk at the Discrete Math Seminar on the average number of points on planes (or affine subspaces) determined by points. The title of his talk was “Average flat-size in complex-representable matroids“.

## Jinyoung Park (박진영) gave a talk on the number of antichains of subsets of an n-element set at the Discrete Math Seminar

On January 11, 2024, Jinyoung Park (박진영) from NYU gave a talk at the Discrete Math Seminar on the number of antichains of subsets of an n-element set. The title of her talk was “Dedekind’s Problem and beyond”.

## Welcome Zichao Dong, Ander Lamaison, and Qiang Zhou, two new members and one new visiting student of the IBS Extremal Combinatorics and Probability Group

The IBS Discrete Mathematics Group welcomes Zichao Dong and Ander Lamaison, two new research fellows at the IBS Extremal Combinatorics and Probability Group and welcomes Qiang Zhou, a new visiting student of the IBS Extremal Combinatorics and Probability Group.

Dr. Zichao Dong received his Ph.D. from the Carnegie Mellon University in 2023 under the supervision of Prof. Boris Bukh.

Dr. Ander Lamaison received his Ph.D. from the Freie Universität Berlin in 2021 under the supervision of Prof. Tibor Szabó.

Qiang Zhou is a graduate student from the Chinese Academy of Sciences. He will stay until the end of June 2024.

## Daniel McGinnis gave a talk on applications of the KKM theorem to various problems in discrete geometry at the Discrete Math Seminar

On January 2, 2024, Daniel McGinnis from Iowa State University gave a talk at the Discrete Math Seminar on applications of the KKM theorem to various problems in discrete geometry. The title of his talk is “Applications of the KKM theorem to problems in discrete geometry“.

## Welcome Mujin Choi (최무진) and Dohyeon Lee (이도현), new graduate students of the IBS Discrete Mathematics Group

The IBS Discrete Mathematics Group welcomes **Mujin Choi (최무진)** and **Dohyeon Lee (이도현)**, new graduate students of the Discrete Mathematics Group from January 2024.

**Mujin Choi** entered the Seoul National University in 2016, received his B.S. degree from the Department of Mathematical Sciences of Seoul National University in 2023, and entered the Department of Mathematical Sciences of KAIST as a graduate student in September 2023. His advisor is Sang-il Oum.

**Dohyeon Lee** entered KAIST as an undergraduate student in 2018 and became a graduate student of the Department of Mathematical Sciences of KAIST in September 2023. His advisor is Andreas Holmsen.

## Welcome Eun Jung Kim (김은정), a new professor in the School of Computing, KAIST

The IBS Discrete Mathematics Group welcomes Prof. Eun Jung Kim (김은정), who is coming to KAIST as a new tenured associate professor in the School of Computing, KAIST on January 1, 2024. She has been one of the frequent visitors and collaborators with the IBS Discrete Mathematics Group.