On February 8, 2022, Pascal Gollin from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on the unified Erdős-Pósa type theorem for cycles in graphs whose edges are labelled by multiple abelian groups. The title of his talk was “A unified Erdős-Pósa theorem for cycles in graphs labelled by multiple abelian groups“.
Bo Ning gave an online talk on the number of triangles and quadrilaterals in a graph with certain conditions on eigenvalues at the Virtual Discrete Math Colloquium
On January 27, 2022, Bo Ning (宁博) from Nankai University, China gave an online talk at the Virtual Discrete Math Colloquium on the number of 3-cycles and 4-cycles in a graph with certain conditions on eigenvalues. The title of his talk was “Substructures and eigenvalues of graphs: Triangles and quadrilaterals“.
O-joung Kwon (권오정) gave a talk on upper bounds of twin-width and reduced-bandwidth of planar graphs and H-minor-free graphs at the Discrete Math Seminar
On January 25, 2022, O-joung Kwon (권오정) from the Incheon National University / IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on upper bounds of the twin-width and reduced-bandwidth of planar graphs and H-minor-free graphs at the Discrete Math Seminar. The title of his talk was “Reduced bandwidth: a qualitative strengthening of twin-width in minor-closed classes (and beyond)“.
Ken-ichi Kawarabayashi gave an online talk on the recent progress towards the directed graph minor theory at the Virtual Discrete Math Colloquium
On January 20, 2022, Ken-ichi Kawarabayashi from the National Institute of Informatics, Japan gave an online talk at the Virtual Discrete Math Colloquium on the recent progress towards the directed graph minor theory. The title of his talk was “Toward Directed Graph Minor Theory“.
Jaehyeon Seo (서재현) gave a talk on the rainbow Turán problem for color-critical graphs at the Discrete Math Seminar
On January 18, 2022, Jaehyeon Seo (서재현) from KAIST gave a talk at the Discrete Math Seminar on the rainbow Turán problem for color-critical graphs. The title of his talk was “A rainbow Turán problem for color-critical graphs“.
Ron Aharoni gave an online talk at the Virtual Discrete Math Colloquium about a stronger version of the Caccetta-Haggkvist conjecture
On January 13, 2022, Ron Aharoni from the Technion gave an online talk at the Virtual Discrete Math Colloquium on a stronger version of the Caccetta-Haggkvist conjecture and recent results. The title of his talk was “A strong version of the Caccetta-Haggkvist conjecture“.
Andreas Holmsen gave a talk about a counterexample to the Bárány-Kalai conjecture on line transversals of a finite family of convex sets at the Discrete Math Seminar
On January 11, 2022, Andreas Holmsen from KAIST gave a talk at the Discrete Math Seminar about the counterexample to the Bárány-Kalai conjecture on line transversals of a finite family of convex sets. The title of his talk was “Some recent results on geometric transversals“.
Seunghun Lee (이승훈) gave a talk on the transversal number and the chromatic number of hypergraphs consisting of facets of a simplicial sphere at the Discrete Math Seminar
On January 4, 2022, Seunghun Lee (이승훈) from the Binghamton University gave a talk at the Discrete Math Seminar on the transversal number and the chromatic number of hypergraphs whose edges are facets of a simplicial sphere. The title of his talk was “Transversals and colorings of simplicial spheres“.
Dabeen Lee (이다빈) received the Excellence Award from the president of IBS
On January 3, 2022, Dabeen Lee from the IBS Discrete Mathematics Group received the Excellence Award from the president of IBS. Congratulations!
“2021 Combinatorics Workshop” was held from December 20 to December 22, 2021 at Yangpyeong
The 2021 Combinatorics Workshop (2021 조합론 학술대회) was held from December 20, 2021 to December 22, 2021 at the Bloomvista, Yangpyeong. There were 5 invited talks and 12 contributed talks.
Invited Speakers
- Dongsu Kim, KAIST
- Joonkyung Lee, Hanyang University
- Hong Liu, University of Warwick, UK
- Suil O, SUNY Korea
- Seonjeong Park, Jeonju University
Speakers of the contributed talks
- Jungho Ahn, KAIST / IBS DIMAG
- Jin-Hwan Cho, NIMS
- Linda Cook, IBS DIMAG
- Cheolwon Heo, Sungkyunkwan University
- Seonghyuk Im, KAIST
- Hyobin Kim, Kyungpook National University
- Minki Kim, IBS DIMAG
- Hyemin Kwon, Ajou University
- Hyunwoo Lee, KAIST
- Sang June Lee, Kyung Hee University
- Jaehyeon Seo, KAIST
- Semin Yoo, KIAS
Organizing Committee
- Jeong-Ok Choi, GIST
- Sang-il Oum, IBS DIMAG / KAIST
- Heesung Shin, Inha University
Participants (50 people, all of whom are fully vaccinated against COVID-19)
- Jungho Ahn, speaker, KAIST / IBS DIMAG
- Sejeong Bang, session chair, Yeungnam University
- Rutger Campbell, IBS DIMAG
- Debsoumya Chakraborti, IBS DIMAG
- Eun-Kyung Cho, Hankuk University of Foreign Studies
- Hyunsoo Cho, Ewha Womans University
- Jin-Hwan Cho, speaker, NIMS
- Jeong-Ok Choi, organizer/session chair, GIST
- Linda Cook, speaker, IBS DIMAG
- Taehyun Eom, KAIST
- Cheolwon Heo, speaker, Sungkyunkwan University
- Seonghyuk Im, speaker, KAIST
- Jihyeug Jang, Sungkyunkwan University
- Dosang Joe, NIMS
- Donggyu Kim, KAIST / IBS DIMAG
- Donghyun Kim, Sungkyunkwan University
- Dongsu Kim, invited speaker, KAIST
- Hyobin Kim, speaker, Kyungpook National University
- Jaehoon Kim, KAIST
- Jang Soo Kim, Sungkyunkwan University
- Jinha Kim, IBS DIMAG
- Minki Kim, speaker, IBS DIMAG
- Seog-Jin Kim, session chair, Konkuk University
- Doowon Koh, Chungbuk National University
- Hyemin Kwon, speaker, Ajou University
- O-joung Kwon, Incheon National University / IBS DIMAG
- Dabeen Lee, IBS DIMAG
- Duksang Lee, KAIST / IBS DIMAG
- Hyunwoo Lee, speaker, KAIST
- Joonkyung Lee, invited speaker, Hanyang University
- Sang June Lee, speaker, Kyung Hee University
- Seung Jin Lee, Seoul National University
- Hong Liu, invited speaker, University of Warwick, UK
- Ben Lund, IBS DIMAG
- Suil O, invited speaker, SUNY Korea
- Jaeseong Oh, KIAS
- Sang-il Oum, organizer/session chair, IBS DIMAG / KAIST
- Jae Hyun Park, Kyung Hee University
- Seonjeong Park, invited speaker, Jeonju University
- Jaehyeon Seo, speaker, KAIST
- Seunghyun Seo, session chair, Kangwon National University
- Heesung Shin, organizer/session chair, Inha University
- Mark Siggers, Kyungpook National University
- Jaebum Sohn, Yonsei University
- Minho Song, Sungkyunkwan University
- U-keun Song, Sungkyunkwan University
- Jeong Hyun Sung, Seoul National University
- Tuan Tran, IBS DIMAG
- Sounggun Wee, KAIST / IBS DIMAG
- Semin Yoo, speaker, KIAS











