Discrete Mathematics Group

IBS-DIMAG Winter School on Graph Minors, Week 2
2025-02-10 - 2025-02-12 | Room B109, IBS (기초과학연구원)

IBS-DIMAG Winter School on Graph Minors, Week 3
2025-02-17 - 2025-02-19 | Room B109, IBS (기초과학연구원)

2025 Summer School on Combinatorics and Algorithms (2025 조합론 및 알고리즘 여름학교)
2025-07-14 14:00 - 2025-07-18 17:00 (Asia/Seoul) | POSTECH, Pohang, Korea
The 2025 Summer School on Combinatorics and Algorithms is a venue for students and early-career researchers to learn selected topics in theoretical computer science and discrete mathematics. It will be a great opportunity for young and aspiring researchers to study topics which are important but not covered during the lectures in the university classes.
Website: https://combialgo.dimag.kr/
Lecturers and Topics

Édouard Bonnet, LIP, CNRS.

Induced Subgraphs and Induced Minors of Graphs

Michał Pilipczuk, University of Warsaw.

Structural Theory of Sparse Graphs

Schedule

Start on 14 July 2025 Monday, 2 PM
End on 18 July 2025 Friday, 5 PM

2025 Combinatorics Workshop (2025 조합론 학술대회)
2025-08-18 - 2025-08-20 | IBS Science Culture Center
Website: https://cw2025.combinatorics.kr
Invited Speakers

Dongsu Kim (KAIST)
Eun Jung Kim (KAIST)
O-joung Kwon (Hanyang University)
Ae Ja Lee (Pennsylvania State University)
Zhicong Lin (Shandong University)

Organizing Committee

Sang-il Oum (엄상일), IBS Discrete Mathematics Group
Jang Soo Kim (김장수), Sungkyunkwan University
Seunghyun Seo (서승현), Kangwon National University

2025 Korean Student Combinatorics Workshop (KSCW2025: 2025 조합론 학생 워크샵)
2025-08-20 - 2025-08-24 | The K-Hotel Gyeongju
Venue
The K-Hotel Gyeongju
Website
https://indico.ibs.re.kr/e/kscw2025
Organizers

Seokbeom Kim (김석범), KAIST and IBS Discrete Mathematics Group
Hyunwoo Lee (이현우), KAIST and IBS Extremal Combinatorics and Probability Group
Jaehyeon Seo (서재현), Yonsei University
Kyungjin Cho (조경진), POSTECH

5th East Asia Workshop on Extremal and Structural Graph Theory
2025-11-27 - 2025-11-30 | Seoul, Korea
The 5th East Asia Workshop on Extremal and Structural Graph Theory is a workshop to bring active researchers in the field of extremal and structural graph theory, especially in the East Asia such as China, Japan, and Korea.

Date
November 27, 2025 Thursday (Arrival Day) — November 30, 2025 Sunday (Departure Day)
Venue
Fraser Place Namdaemun, Seoul
Program Book
Invited Speakers

Shinya Fujita (Yokohama City University)
Jie Han (Beijing Institute of Technology)
Tony Huynh (IBS Discrete Mathematics Group)
Jaehoon Kim (KAIST)
O-joung Kwon (Hanyang University / IBS Discrete Mathematics Group)
Hong Liu (IBS Extremal Combinatorics and Probability Group)
Jie Ma (University of Science and Technology of China / Tsinghua University)
Shun-ichi Maezawa (Nihon University)
Boram Park (Seoul National University)
Shohei Satake (Kumamoto University)
Tuan Tran (University of Science and Technology of China)
Shoichi Tsuchiya (Senshu University)
Xuding Zhu (Zhejiang Normal University)

Organizers
Seog-Jin Kim, Sang-il Oum, Kenta Ozeki, Hehui Wu
Registration
Invitation Only. https://indico.ibs.re.kr/event/1041/
There is no registration fee and one dinner (banquet) will be provided.
History

4th East Asia Workshop on Extremal and Structural Graph Theory

Mar. 27 – Mar. 31, 2025.
School of Mathematics, Sun-Yet Sen University, Guangzhou, China
Organizers: Ping Hu, Seog-Jin Kim, Kenta Ozeki, Hehui Wu.

3rd East Asia Workshop on Extremal and Structural Graph Theory

Nov. 1- Nov. 5, 2023.
The Southern Beach Hotel & Resort, Okinawa, Japan
Sponsored by the IBS Discrete Mathematics Group, Korea.
Organizers: Seog-Jin Kim, Sang-il Oum, Kenta Ozeki, Hehui Wu.

2nd East Asia Workshop on Extremal and Structural Graph Theory

Oct. 31-Nov. 4, 2019.
Held at UTOP UBLESS Hotel, Jeju, Korea
Sponsored by the IBS Discrete Mathematics Group, Korea.
Organizers: Seog-Jin Kim, Sang-il Oum, Kenta Ozeki, Hehui Wu.

1st East Asia Workshop on Extremal and Structural Graph Theory

Nov. 30-Dec. 2, 2018.
Held and sponsored by the Shanghai Center for Mathematical Sciences in China, under the name 2018 SCMS Workshop on Extremal and Structural Graph Theory.
Organizers: Ping Hu, Seog-Jin Kim, Kenta Ozeki, Hehui Wu.

Thursday
November 27, 2025

Time
Speaker
Affiliation
Title

16:00–18:00

Registration & Discussions

Friday
November 28, 2025

Time
Speaker
Affiliation
Title

09:20–10:00
Jaehoon Kim
KAIST
Hamilton cycles in pseudorandom graphs: Dirac’s theorem and approximate decompositions

10:00–10:30

Coffee Break

10:30–11:10
Jie Ma
University of Science and Technology of China / Tsinghua University
An exponential improvement for Ramsey lower bounds

11:20–12:00
Shinya Fujita
Yokohama City University
Connectivity keeping paths containing prescribed vertices in highly connected triangle-free graphs

12:00–14:00

Lunch Break

14:00–14:40
Shun-ichi Maezawa
Nihon University
Tree versus tree of preorder induced by rainbow forbidden subgraphs

14:50–15:30
Tony Huynh
IBS Discrete Mathematics Group
Rainbow triangles and the Erdős–Hajnal problem in projective geometries

15:30–15:50

Coffee Break

16:30–17:30

Problem Session

Saturday
November 29, 2025

Time
Speaker
Affiliation
Title

09:20–10:00
Xuding Zhu
Zhejiang Normal University
TBA

10:00–10:30

Coffee Break

10:30–11:10
Hong Liu
IBS Extremal Combinatorics and Probability Group
Chromatic, homomorphism, blowup thresholds and beyond

11:20–12:00
Shohei Satake
Kumamoto University
TBA

12:00–14:00

Lunch Break

14:00–14:40
Shoichi Tsuchiya
Senshu University
On the number of contractible edges in plane triangulations

14:50–15:30
Tuan Tran
University of Science and Technology of China
Littlewood-Offord bounds on the symmetric groups and applications

15:30–15:50

Coffee Break

15:50–16:30
O-joung Kwon
Hanyang University / IBS Discrete Mathematics Group
A coarse Erdős–Pósa theorem

16:30–17:30

Problem Session

18:30–21:00

Banquet

Sunday
November 30, 2025

Time
Speaker
Affiliation
Title

10:00–10:40
Jie Han
Beijing Institute of Technology
Perturbation of dense graphs

10:40–10:50

Break

10:50–11:30
Boram Park
Seoul National University
Graphs avoiding cycles of length 0 modulo 4

11:30–12:00

Closing

2026 Workshop on Topological Combinatorics
2026-06-28 - 2026-07-11 | GIST
The 2026 Workshop on Topological Combinatorics will be held from June 28 to July 11, 2026 at Gwangju Institute of Science and Technology (GIST), located in Gwangju in the southwest of Republic of Korea.
The workshop aims to bring together researchers interested in applications of topology to combinatorics and related areas. This will be the fifth workshop in a series initiated by Ron Aharoni (August 2018 in Shantou, July 2019 in Prague, July 2020 on Zoom, and June 2024 in Paris).
The first week (June 28 – July 04) will be reserved for presentations, while the following days (July 05 – July 11) will be for discussion and collaborations.
The campus offers a variety of amenities, including a guesthouse that can accommodate approximately 20 guests.
In addition, various lodging options are available within a 15–20 minute walking distance.
We are planning to provide accommodation for all invited participants, and we are also considering offering partial travel support for those with limited funding.

Website: https://sites.google.com/view/2026topocomb

2026 Korean Student Combinatorics Workshop
2026-07-27 - 2026-07-31 | Gongju Hanok Village, Gongju
Website: https://kscw.combinatorics.kr/

2026 Summer School on Combinatorics and Algorithms (2026 조합론 및 알고리즘 여름학교)
2026-08-10 - 2026-08-14 | Bldg. E11, KAIST
The 2026 Summer School on Combinatorics and Algorithms is a venue for students and early-career researchers to learn selected topics in theoretical computer science and discrete mathematics. It will be a great opportunity for young and aspiring researchers to study topics which are important but not covered during the lectures in the university classes.
Website: https://combialgo.dimag.kr/2026/
Lecturers and Topics

Daniel Dadush, CWI, Amsterdam

Algorithms & Geometry of Linear Programming

Magnus Wahlström, Royal Holloway, University of London

Matroids, delta-matroids, and applications

Schedule

Start on 10 August 2026 Monday, 2 PM
End on 14 August 2025 Friday, 5 PM

2026 Combinatorics Workshop (2026 조합론 학술대회)
2026-10-20 - 2026-10-22 | Konjiam Resort, EW Village, B2, Meeting Room OPUS2
Combinatorics Workshop (조합론 학술대회) is an annual conference for researchers in combinatorics and related areas in Korea. It was started in 2004 by the Yonsei University BK21 Research Group. Since 2013, this workshop has been advised by the committee of discrete mathematics of the Korean Mathematical Society.
Website: https://cw2026.combinatorics.kr/en/
Venue
Konjiam Resort, EW Village, B2, Meeting Room OPUS2
(278, Docheogwit-Ro, Docheok-Myeon, Gwangju-Si, Gyeonggi-Do, Korea)

Travel Instructions

Dates
October 20 to 22, 2026
Plenary Speaker
Alexander V. Kostochka (UIUC)
Invited Speakers

Cheolwon Heo (SUNY Korea)
Tony Huynh (IBS DIMAG)
Dabeen Lee (Seoul National University)
Jongbaek Song (Pusan National University)

Contributed Talks
Each contributed talk will be about 20 minutes, including questions. Please note that we may stop accepting contributed talk applications before the deadline if all available slots are filled.
If you are interested in giving a contributed talk at the workshop, please submit an abstract by August 31, 2026.
To apply for a contributed talk, go to Call for Abstracts on Indico and click “Submit new abstract.” You may need to create an IBS Indico account.
Registration
Registration link
The registration deadline is August 31, 2026.
Organizing Committee

Ilkyoo Choi (최일규), Hankuk University of Foreign Studies, IBS Discrete Mathematics Group, KIAS
Sang-il Oum (엄상일), IBS Discrete Mathematics Group
Boram Park (박보람), Seoul National University

Advisory Committee
Committee of Discrete Mathematics, The Korean Mathematical Society (Chair: Sang-il Oum)
Sponsors

IBS Discrete Mathematics Group
Korean Mathematical Society
Seoul National University
Hankuk University of Foreign Studies
