On August 14, 2024, Peter Nelson from the University of Waterloo gave a talk at the Discrete Math Seminar on formalizing the matroid theory on LEAN at the Discrete Math Seminar. The title of his talk was “Formalizing matroid theory in a proof assistant“.

## The 2024 summer school was held at IBS for 2 weeks at IBS with lectures by Boris Bukh (CMU) and Tung Nguyen (Princeton University)

The 2024 summer school was held at IBS for two weeks, from July 29 to August 9, 2024. It was organized by the IBS Extremal Combinatorics and Probability Group and featured lectures by Boris Bukh from Carnegie Mellon University and Tung Nguyen from Princeton University.

## Daniel Král’ gave a talk on the minor closure of matroid depth parameters at the Discrete Math Seminar

On August 6, 2024, Daniel Král’ from Masaryk University gave a talk at the Discrete Math Seminar on the minor closures of depth parameters of matroids. The title of his talk was “Matroid depth and width parameters“.

## 2024 Korean Student Combinatorics Workshop was held in Gongju from July 29 to August 2, 2024

The 2024 Korean Student Combinatorics Workshop (KSCW2024, 2024 조합론 학생 워크샵) was held in Gongju from July 29 to August 2, 2024. Sponsored by the IBS Discrete Mathematics Group, this event aims to provide a platform for Korean graduate students working on combinatorics and related areas to establish a foundation for collaborative research. It was organized by four students of KAIST/IBS: Donggyu Kim (김동규), Seokbeom Kim (김석범), Seonghyuk Im (임성혁), and Hyunwoo Lee (이현우). The workshop featured two invited talks by Semin Yoo (유세민) and Jungho Ahn (안정호), as well as open problem sessions followed by ample time for joint work.

## Welcome Meike Hatzel, a new member of the IBS Discrete Mathematics Group

The IBS discrete mathematics group welcomes Dr. Meike Hatzel, a new research fellow at the IBS discrete mathematics group from August 1, 2024. She received his Ph.D. from the Technische Universität Berlin under the supervision of Prof. Stephan Kreutzer. She is interested in graph theory, in particular the structure theory of directed graphs.

## We are hiring! Senior Research Fellow Position at the IBS Discrete Mathematics Group

The IBS Discrete Mathematics Group (DIMAG) in Daejeon, Korea invites applications for one senior research fellow position.

DIMAG is a research group that was established on December 1, 2018 at the Institute for Basic Science (IBS), led by Chief Investigator, Dr. Sang-il Oum. DIMAG is located at the headquarters of IBS in Daejeon, South Korea, a city of 1.5 million people.

Website: https://dimag.ibs.re.kr/

Currently, DIMAG consists of researchers from various countries and the work is done in English. DIMAG is co-located with the IBS Extremal Combinatorics and Probability Group (ECOPRO).

Successful candidates for this position are expected to have research experience in **Discrete Mathematics**, in particular in Structural Graph theory, Combinatorial Optimization, Matroid Theory, and Algorithms, for **10 years or more after their Ph.D.’s**.

The appointment is initially for two years and can be extended further after reviews of the research performance until the group’s closure or the retirement age.

The starting annual salary is no less than KRW 96,000,000, if the successful candidate has 10 years or more research experience after Ph.D.’s.

The expected appointment date is June 1, 2025, and it can be adjusted to earlier or later, but no later than September 1, 2025. This is purely research position and will have no teaching duties.

A complete application packet should include:

• AMS standard cover sheet (preferred) or cover letter (PDF format)

• Curriculum vitae, including a list of publications and preprints (PDF format)

• Research statement (PDF format)

• Consent to Collection and Use of Personal Information & Application for the IBS (PDF file)

For full consideration, applicants should email all the items to dimag@ibs.re.kr by **August 19, 2024, 18:00 KST**.

DIMAG encourages applications from individuals of diverse backgrounds.

Suggested E-mail subject from applicants: [DIMAG – name]

e.g., [DIMAG – PAUL ERDOS]

## Euiwoong Lee (이의웅) gave a talk on the parameterized complexity of approximating the minimum size of a deletion set to make a graph belong to a fixed class

On July 30, 2024, Euiwoong Lee (이의웅) from the University of Michigan gave a talk at the Discrete Math Seminar on the parameterized complexity of approximating the minimum size of a deletion set to make a graph belong to a fixed class. The title of his talk was “Parameterized Approximability of F-Deletion Problems“.

## Two of our former members, Dong Yeap Kang (강동엽) and Abhishek Methuku, and their collaborators received the 2024 Frontiers of Science Awards at the International Congress for Basic Science held in China for their paper on the proof of Erdős-Faber-Lovász conjecture

On July 14, 2024, Two of our former members, Dong Yeap Kang (강동엽) and Abhishek Methuku, and their collaborators (Tom Kelly, Daniela Kühn, and Deryk Osthus) received the 2024 Frontiers of Science Award (FSA) at the International Congress for Basic Science held in Beijing from July 14 to July 26, 2024, for their paper on the proof of Erdős-Faber-Lovász conjecture published in Annals of Mathematics. Dong Yeap Kang and Abhishek Methuku are former members of the IBS Discrete Mathematics Group. Congratulations!

## More than 100 students attended the 2024 Summer School on Combinatorics and Algorithms held at KAIST from July 22 to 26, 2024

More than 100 students attended the 2024 Summer School on Combinatorics and Algorithms from July 22 to 26, 2024. Chien-Chung Huang from ENS Paris and Sebastian Wiederrecht from the IBS Discrete Mathematics Group gave lectures. This event was organized by Jungho Ahn (KIAS), Eunjung Kim (KAIST), Eunjin Oh (POSTECH), and Sang-il Oum (IBS Discrete Mathematics Group / KAIST) and sponsored by the IBS Discrete Mathematics Group, KAIST, and POSTECH.

## IBS-DIMAG Workshop on Combinatorics and Geometric Measure Theory was held at IBS

The IBS-DIMAG Workshop on Combinatorics and Geometric Measure Theory was held at IBS from July 14 to July 19, 2024. There were 23 talks, including plenary talks by János Pach (Rényi Institute of Mathematics) and Pertti Mattila (University of Helsinki) and invited talks by Izabella Łaba (University of British Columbia), Hong Wang (NYU), and Cosmin Pohoata (Emory University).

## Organizers

- Doowon Koh (Chungbuk National University)
- Ben Lund (IBS Discrete Mathematics Group)
- Sang-il Oum (IBS Discrete Mathematics Group / KAIST Department of Mathematical Sciences)