On March 21, 2022, Jaehoon Kim (김재훈) from KAIST gave a talk at the Discrete Math Seminar on the Ramsey number with respect to a cycle graph and an arbitrary graph. The title of his talk was “Ramsey numbers of cycles versus general graphs”.

## Jaehoon Kim (김재훈) gave a talk on a sufficient condition for a 2-complex to have a unique embedding in a 3-dimensional space, which is a 3-dimensional analog of Whitney’s theorem on the uniqueness of planar embeddings of a 3-connected graph at the Discrete Math Seminar

On November 9, 2021, Jaehoon Kim (김재훈) from KAIST gave a talk at the Discrete Math Seminar on a 3-dimensional analog of Whitney’s theorem on the uniqueness of planar embeddings of a 3-connected graph. The title of his talk was “2-complexes with unique embeddings in 3-space“.

## Jaehoon Kim (김재훈) gave a talk on the minimum spectral radius of $K_{r+1}$-saturated graphs at the Discrete Math Seminar

On July 13, 2021, Jaehoon Kim (김재훈) from KAIST gave a talk at the Discrete Math Seminar on a lower bound on the spectral radius of a $K_{r+1}$-saturated graph. The title of his talk was “$K_{r+1}$-saturated graphs with small spectral radius“.

## Jaehoon Kim (김재훈) gave a talk on a resilience version of Pósa’s theorem regarding Hamiltonian cycles at the Discrete Math Seminar

On June 23, 2020, Jaehoon Kim (김재훈) from KAIST presented his work with Padraig Condon, Alberto Espuny Diaz, Daniela Kühn and Deryk Osthus on a resilience version of Pósa’s theorem regarding a sufficient condition on the degree sequence for a graph to have a Hamiltonian cycle at the Discrete Math Seminar. The title of his talk is “A resilience version of Pósa’s theorem“.

## “2019 Combinatorics Workshop” was held from August 13 to August 15, 2019 at Incheon.

The **2019 Combinatorics Workshop (2019 조합론 학술대회)** was held from August 13, 2019 to August 15, 2019 at the SKYPARK Hotel, Songdo, Incheon. There were 16 talks.

### Plenary Speaker

- Mihyun Kang (강미현), Graz University of Technology

### Keynote Speakers

- Jaehoon Kim (김재훈), KAIST
- Seung Jin Lee (이승진), Seoul National University
- Meesue Yoo (유미수), Dankook University

### Invited Speakers

- Eun-Kyung Cho (조은경), Hankuk University of Foreign Studies
- Soogang Eoh (어수강), Seoul National University
- JiSun Huh (허지선), Sungkyunkwan University
- Jihyeug Jang (장지혁), Sungkyunkwan University
- Dong Yeap Kang (강동엽), KAIST and IBS Discrete Mathematics Group
- Min Jeong Kang (강민정), Incheon National University
- Dabeen Lee (이다빈), IBS Discrete Mathematics Group
- Kang-Ju Lee (이강주), Seoul National University
- Myeonghwan Lee (이명환), Incheon National University
- Jihye Park (박지혜), Yeungnam University
- Sun-mi Yun (윤선미), Sungkyunkwan University

## “2019-2 IBS One-Day Conference on Extremal Graph Theory” was held on August 12, 2019.

The 2019-2 IBS One-Day Conference on Extremal Graph Theory was held on August 12, 2019 at the IBS Discrete Mathematics Group. There were four talks. Here is a list of talks.

- Jaehoon Kim (김재훈), KAIST:
*Tree decompositions of graphs without large bipartite holes* - Hong Liu (刘鸿), University of Warwick:
*Recent advance in Ramsey-Turán theory* - Abhishek Methuku, IBS Discrete Mathematics Group:
*Bipartite Turán problems for ordered graphs* - Péter Pál Pach, Budapest University of Technology and Economics:
*On some applications of graph theory to number theoretic problems*