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Overview
Overview
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.
Organized by Andreas Holmsen (andreash@kaist.edu, KAIST & IBS), Jinha Kim (jinhakim@jnu.ac.kr, CNU & IBS), and Minki Kim (minkikim@gist.ac.kr, GIST)
Supported by GIST, IBS DIMAG, and the NRF of Republic of Korea.
Program
Program
- June 28th (Sun)
15:00~ Arrival / Meeting / Discussion at Hotel
- July 06th - July 10th: Week 2 - Discussion & Collaboration
- June 29th (Mon) Room 203, Natural Science Building (E8)
09:30 ~ 10:00 Registration & Coffee
10:00 ~ 12:00 Session 1 (Chair: Pavle Blagojević)
10:00 ~ 11:00 Suyoung Choi (Ajou University)
Real toric manifolds and their geometry
11:00 ~ 11:30 Bálint Zsigri (FU Berlin)
Intersection patterns via homotopy colimits
11:30 ~ 12:00 Martin Tancer (Charles University)
Non-acyclic spaces of line transversals
12:00 ~ 14:00 Lunch & Discussion
10:00 ~ 12:00 Session 2 (Chair: Kai Fong Ernest Chong)
14:00 ~ 15:00 Denys Bulavka (Dalhousie University)
The typical Algebraic Shifting of Graphs and Surfaces
15:00 ~ 15:30 Younghan Yoon (Ajou University)
All full subcomplexes of Bier spheres
15:30 ~ 16:00 Jaewoo Jung (DIGST)
A Froberg Type Theorem for Higher Secant Complexes
16:00 ~ 18:00 Discussion
18:00 ~ 19:30 Dinner
- June 30th (Tue) Room 203, Natural Science Building (E8)
09:00 ~ 10:00 Coffee
10:00 ~ 12:00 Session 3 (Chair: Florian Frick)
10:00 ~ 11:00 Pavle Blagojevic
Towards the final Tverberg theorem
11:00 ~ 11:30 Edgardo Roldan-Pensado
Some old and new mass partition results
11:30 ~ 12:00 Leonardo Martinez-Sandoval
A linear hypersimplicial Van Kampen-Flores theorem
12:00 ~ 14:00 Lunch & Discussion
10:00 ~ 12:00 Session 4 (Chair: Frederic Meunier)
14:00 ~ 15:00 Woojin Kim
Combinatorial Aspects of Multi-parameter Persistent Homology
15:00 ~ 15:30 Martin Loebl
Connectivity Revisited
15:30 ~ 16:00 Matej Stehlik
Vertex-critical subgraphs of Knerser graphs where topological bounds fail
16:00 ~ 18:00 Discussion
18:00 ~ 19:30 Dinner
- July 1st (Wed) Room 203, Natural Science Building (E8)
09:00 ~ 10:00 Coffee
10:00 ~ 12:00 Session 5 (Chair: Matej Stehlik)
10:00 ~ 10:30 Wei-Chia Chen
Chromatic number of 3-stable Knerser graphs
10:00 ~ 10:30 Seunghun Lee
On an extension problem on the moment curve
11:00 ~ 11:30 Penny Haxell
Algorithms for Independent Transversals and Reconfiguration
11:30 ~ 12:00 Florian Frick
Topology and sign-rank
12:00 ~ 14:00 Lunch & Discussion
10:00 ~ 12:00 Session 6 (Chair: Martin Tancer)
14:00 ~ 15:00 Daniel McGinnis
Multi-extremal Betti numbers and colored algebraic shifting
15:00 ~ 15:30 Frederic Meunier
Fair and efficient allocation of indivisible items under category constraints
15:30 ~ 16:00 Ariadna Olvera Sampieri
Orthogonal star transversals in d-dimensional space
16:00 ~ 18:00 Discussion
18:00 ~ 19:30 Dinner
- July 2nd (Thu) Room 203, Natural Science Building (E8)
09:00 ~ 10:00 Coffee
10:00 ~ 12:00 Session 7 (Chair: Edgardo Roldan-Pensado)
10:00 ~ 11:00 Nikola Sadovek
On Geometric Transversal Theory and Intersection Patterns of Convex Sets
11:00 ~ 11:30 Mikhail Bludov
Colorful Caratheodory Theorem for Spanning k-trees
11:30 ~ 12:00 Michael Dobbins
MacPhersonians and pseudocircle arrangements
12:00 ~ 14:00 Lunch & Discussion
10:00 ~ 12:00 Session 8 (Chair: Martin Loebl)
14:00 ~ 15:00 Kai Fong Ernest Chong
Enumerative properties of Buchsbaum complexes
15:00 ~ 15:30 Lu Yu
Simplified proof of the equipartition result of Avvakumov and Karasev
15:30 ~ 16:00 Carmen Arana
Chromatic number of generalized Knerser graphs
16:00 ~ 18:00 Discussion
18:00 ~ 20:00 Banquet (해육반 https://maps.app.goo.gl/6EQwuEkf3ywSD4F27)
- July 3rd (Fri) Room 203, Natural Science Building (E8)
09:00 ~ 10:00 Coffee
10:00 ~ 12:00 Session 9 (Chair: Woojin Kim)
10:00 ~ 11:00 Duc-Khanh Nguyen
Steenrod length and a problem of Vakil
11:00 ~ 11:30 Minh Quang Le
kNN: From a Topological Data Analysis Perspective to a Topological Combinatorics Approach
11:30 ~ 12:00 Minho Cho
Colorful circuits and colorful topes in oriented matroids
12:00 ~ 14:00 Lunch & Discussion
14:00 ~ 18:00 Duscission
18:00 ~ 19:30 Dinner
- July 6th (Mon) Room 225, GIST College Building A (N4)
09:00 ~ 09:30 Coffee
09:30 ~ 12:00 Open Problem Session
12:00 ~ 15:00 Lunch & Discussion
15:00 ~ 16:00 Lecture by Pavle Blagojevic
16:00 ~ 18:00 Discussion
18:00 ~ 19:30 Dinner
Participants
Participants
(Tentative List, Updated on Feb 07, 2026 | Name (Instutute): participation dates) * Organizers | # long talk | $ short talk
* Andreas Holmsen (KAIST & IBS): Week 1 & 2
* Jinha Kim (Chonnam National University): Week 1 & 2
* Minki Kim (GIST): Week 1 & 2
# Pavel Blagojevic: Week 1 & 2
$ Penny Haxell: Week 1 & 2
$ Leonardo Ignacio Martinez-Sandoval: Week 1 & 2 +
# Suyoung Choi: Week 1
# Woojin Kim: Week 1
$ Matej Stehlik: Week 1 & 2
$ Carmen Arana: Week 1 & 2
# Nikola Sadovek: Week 1 & 2
$ Martin Loebl: Week 1 & 2
$ Frederic Meunier: Week 1 & 2
$ Michael Dobbins: July 2 ~ July 10
$ Edgardo Roldan-Pensado: Week 1 & 2
$ Lu Yu: Week 1 & 2
# Daniel McGinnis: Week 1 & 2
# Denys Bulavka: Week 1 & 2 +
$ Minho Cho: Week 1 & 2
# Kai Fong Ernest Chong: Week 1 & 2
$ Martin Tancer: Week 1 & 2
Jongbaek Song: Week 1
$ Minh Le: Week 1 & 2
$ Florian Frick: Week 1 & 2
Wei-Chia Chen: Week 1 & 2
$ Bálint Zsigri: Week 1
Hyobeen Kim: Week 1
Dohyeon Lee: Week 1 & 2
Semin Yoo: Week 1
$ Younghan Yoon: Week 1
Seunghun Lee: Week 1 & 2
Ilkyoo Choi: Week 1 (partially)
# Duc-Khanh Nguyen: Week 1
Yeonghun Jung: Week 1
Eunku Park: Week 1
Jihye Park: Week 1
Hyungu Kim: Week 1 & 2
Bokhee Im: Week 1
Hricha Acharya: Week 1 & 2
$ Jaewoo Jung: Week 1
$ Wei Rao: Week 1 & 2
Pavel Patak: Week 1 & 2
$ Mikhail Bludov: Week 1 & 2
$ Ariadna Olvera Sampieri: Week 1 & 2
Taehyun Eom: Week 1
Levi Axelrod: Week 1 & 2
Heon Joon Pyun: Week 1
Jeonghyun Yoon: Week 1
Geunho Lim: Week 1 & 2
Donghun Kim: Week 1
Eon Lee: Week 1 & 2
[Accommodation]
(Korean)
호텔명: 첨단호텔
주소: 광주광역시 광산구 첨단중앙로152번길 47 (쌍암동)
(English)
Name of the Hotel: Cheomdan Hotel
Address: 47, Cheomdanjungang-ro 152beon-gil, Gwangsan-gu, Gwangju
[Transportation from Incheon Airport to Gwangju] link by Incheon Airport
Please note that there are two different cities named 'Gwangju' in Korea: Gwangju in Gyeonggi Province and Gwangju in Jeolla Province. Since GIST is located in Gwangju, Jeolla Province, please double-check your destination when traveling from the airport to avoid any confusion.
1. By Airport Limousine Bus (guide)
- Route: Direct bus from the airport to Gwangju (U-Square Bus Terminal)
- Duration: Approximately 4.5~5 hours
- Fare: About 40,000KRW
- How to use:
Tickets can be purchased at the transportation center. (1st floor of the passenger terminal)
Look for “Airport Limousine Bus” signs or ask at the information desk.
Buses depart several times per day. (Timetable can be found here)
- Arrival in Gwangju:
The bus arrives at Gwangju U-Square Bus terminal.
From there, you can take a taxi to GIST or to the hotel, and it will take approximately 20~25 minutes (fare: within 15,000KRW).
2. By KTX (High-speed train)
- Route: Incheon International Airport -> AREX(Airport Railroad Express) to Seoul Station -> KTX to Gwangju-Songjeong Station
- Duration: Approximately 4.5~5 hours in total (1 hour by AREX +2.5 hours by KTX + transfer time)
- Fare: About 55,000~60,000KRW in total
- How to use:
Take the AREX from Incheon International Airport to Seoul Station
At Seoul Station, transfer to the KTX bound for Gwangju-Songjeong Station
Train tickets can be purchased online in advance (KORAIL website/app) or at the station.
- Arrival in Gwangju:
From Gwangju-Songjeong Station, you can take a taxi to GIST or to the hotel, and it will take approximately 25~30 minutes (fare: within 20,000KRW).
The following link might be useful: https://www.tictivity.com/en/blog/k-eta-guide
This workshop is supported by GIST, Chonnam National University, National Research Foundation of Korea (RS-2025-00555526, RS-2025-00558178) and Institute for Basic Science (IBS-R029-C1).
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