Seokbeom Kim (김석범), The structure of △(1, 2, 2)-free tournaments

Room B332 IBS (기초과학연구원)

Given a tournament S, a tournament is S-free if it has no subtournament isomorphic to S. Until now, there have been only a small number of tournaments S such that the complete structure of S-free tournaments is known. Let (1,2,2) be a tournament obtained from the cyclic triangle by substituting two-vertex tournaments for

Meike Hatzel, TBA

Room B332 IBS (기초과학연구원)

On-Hei Solomon Lo, Minors of non-hamiltonian graphs

Room B332 IBS (기초과학연구원)

A seminal result of Tutte asserts that every 4-connected planar graph is hamiltonian. By Wagner's theorem, Tutte's result can be restated as: every 4-connected graph with no K3,3 minor is hamiltonian. In 2018, Ding and Marshall posed the problem of characterizing the minor-minimal 3-connected non-hamiltonian graphs. They conjectured that every 3-connected non-hamiltonian graph contains a

Attila Jung, The Quantitative Fractional Helly Theorem

Room B332 IBS (기초과학연구원)

Two celebrated extensions of Helly's theorem are the Fractional Helly theorem of Katchalski and Liu (1979) and the Quantitative Volume theorem of Barany, Katchalski, and Pach (1982). Improving on several recent works, we prove an optimal combination of these two results. We show that given a family F of n convex sets in Rd such

Sergey Norin, TBA

Room B332 IBS (기초과학연구원)

2025 Summer School on Combinatorics and Algorithms (2025 조합론 및 알고리즘 여름학교)

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. Lecturers

5th East Asia Workshop on Extremal and Structural Graph Theory

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 Seoul (TBA)

IBS 이산수학그룹 Discrete Mathematics Group
기초과학연구원 수리및계산과학연구단 이산수학그룹
대전 유성구 엑스포로 55 (우) 34126
IBS Discrete Mathematics Group (DIMAG)
Institute for Basic Science (IBS)
55 Expo-ro Yuseong-gu Daejeon 34126 South Korea
E-mail: dimag@ibs.re.kr, Fax: +82-42-878-9209
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