기초과학연구원 이산수학그룹
On October 13, 2026, Julien Codsi from Princeton University gave a talk on various results on the tree-independence number of graphs. The title of his talk was “Recent progress in the tree-⍺ world“.
On October 6, 2026, Daniel McGinnis from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on a commutative-algebraic approach to regularity that yields an optimal colorful fractional Helly theorem for d-Leray simplicial complexes. The title of his talk was “Multi-generic initial ideals, regularity, and the optimal colorful fractional Helly theorem for d-Leray complexes“.
On September 22, 2026, David R. Wood from Monash University gave a talk on coloring graphs without K_t minor with t colors while avoiding large monochromatic components at the Discrete Math Seminar. The title of his talk was “Proof of the Clustered Hadwiger Conjecture“.
On September 18, 2026, David R. Wood from Monash University gave a talk showing the proof of the Erdős-Sós conjecture found by GPT Astra at the Discrete Math Seminar. The title of his talk was “The Erdős-Sós Theorem“.
On September 15, 2026, Gabriëlle Zwaneveld from University of Amsterdam gave a talk on oriented graphs with the same number of neighbors and second neighbors at each vertex, motivated by Seymour’s second neighborhood conjecture, at the Discrete Math Seminar. The title of her talk was “On Seymour-tight orientations“.
The IBS Discrete Mathematics Group (DIMAG) in Daejeon, Korea invites applications for four research fellowship positions (senior researcher positions).
DIMAG is a research group that was established on December 1, 2018 at the Institute for Basic Science (IBS), led by its Chief Investigator (CI) Sang-il Oum. DIMAG is located at the headquarters of IBS in Daejeon, South Korea, a city of 1.5 million people.
Website : https://dimag.ibs.re.kr/
Currently, DIMAG consists of researchers from various countries and the work is done in English. DIMAG is co-located with the IBS Extremal Combinatorics and Probability Group (ECOPRO).
Successful candidates for the research fellowship positions will be new or recent PhDs with outstanding research potential in all fields of Discrete Mathematics with emphasis on Structural Graph Theory, Extremal Graph Theory, Combinatorial Optimization, Matroid Theory, and Algorithms.
This appointment is for about two years, and the starting salary is no less than KRW 66,000,000. The appointment is one-time renewable up to 5 years in total, contingent upon the outstanding performance of the researcher. The expected appointment date is September 1, 2027, and it can be adjusted to earlier or later, but no later than December 1, 2027. This is purely a research position and will have no teaching duties. However, if desired, successful candidates may have the opportunity to teach at KAIST.
A complete application packet should include:
1. AMS standard cover sheet (preferred) or cover letter (PDF format)
2. Curriculum vitae including a list of publications and preprints (PDF format)
3. Research statement (PDF format)
4. Consent to Collection and Use of Personal Information (form available on the application page)
5. 3 recommendation letters
For full consideration, applicants should upload items 1, 2, 3, and 4 on the application website (https://dimag.ibs.re.kr/apply) by November 30, 2026 (Anywhere on Earth (AoE)), and arrange their recommendation letters to be submitted directly by the letter writers through the link sent via email during the online application process by December 1, 2026 (Anywhere on Earth (AoE)).
Based on the information entered during the online application process, a submission link will be sent to each recommender. Only recommendation letters submitted directly by the recommender will be accepted. Applications with missing required documents will not be considered. DIMAG encourages applications from individuals of diverse backgrounds.
For Korean citizens who have not yet completed their military duty: 전문연구요원 종사를 희망하는 경우에는 지원 의사와 병역 관계를 cover letter 등에 표시하여 제출 필요. 다만 현역입영대상자의 전문연구요원 신규 편입은 불가하며, 보충역 대상자 및 타 기관에서 전직해서 오는 경우에 한하여 지원 가능(전직 요건이 충족 되어야만 함)
Inquiry: dimag _@_ ibs.re.kr (remove _)
The IBS Discrete Mathematics Group held the “2026 DIMAG Internal Workshop” at the Kensington Resort in Namwon on September 9-13, 2026. Participants included all but one of DIMAG’s current members, as well as Sebastian Wiederrecht (KAIST), Minki Kim (GIST), Seonghyuk Im (KIAS), and Hojin Chu (KIAS). Every participant presented open problems, and there were active discussions throughout, leading to several progress reports.
On September 8, 2026, Olga Medrano Martín del Campo from the IBS Discrete Mathematics Group gave a talk on ε-saturation of classes of graphs of bounded Littlestone dimension and VC dimension at the Discrete Math Seminar. The title of her talk was “Epsilon-saturation for Littlestone classes and stable graphs“.
On September 1, 2026, Ben Lund from Xidian University, China gave a talk at the Discrete Math Seminar on an upper bound of the number of incidences between points and n-dimensional projective subspaces in PG(n+d,q). The title of his talk was “Incidences between points and n-flats in PG(n+d,q)“.
The IBS Discrete Mathematics Group welcomes Dr. Xiying Du, a new research fellow at the IBS Discrete Mathematics Group, starting on September 1, 2026.
She received her Ph.D. from the Georgia Institute of Technology under the supervision of Prof. Rose McCarty and Prof. Xingxing Yu. She is interested in structural graph theory, in particular graph linkages, degree-boundedness, and induced subgraphs.