기초과학연구원 이산수학그룹
On September 9, 2025, Katherine Perry from the Soka University of America gave a talk at the Discrete Math Seminar on the relationship between the distinguishing number and the fixing number of trees. The title of her talk was “Symmetry breaking in trees“.
On September 2, 2025, Zhifei Yan from the IBS Extremal Combinatorics and Probability Group gave a talk at the Discrete Math Seminar on covering the vertex set of a properly edge-colored graph with two vertex-disjoint rainbow cycles. The title of his talk was “A Rainbow version of Lehel’s conjecture“.
On August 29, 2025, Sang-il Oum (엄상일) from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on the Erdős-Pósa property for vertex-minors and perturbations of graphs. The title of his talk was “The Erdős-Pósa property for circle graphs as vertex-minors“.
The 2025 Korean Student Combinatorics Workshop (KSCW2025, 2025 조합론 학생 워크샵) was held in The-K Hotel Gyeongju from August 20 to August 24, 2025. Sponsored by the IBS Discrete Mathematics Group, this event aims to provide a platform for Korean graduate students working on combinatorics and related areas to establish a foundation for collaborative research. This is a continuation of the same workshop held last year.
This workshop was organized by the following four graduate students.
On August 12, 2025, Chien-Chung Huang from CNRS, DI ENS gave a talk at the Discrete Math Seminar on finding a small substructure in a matroid that allows a good approximation for the matroid intersection while having some robustness properties. His talk was titled “Robust Sparsification for Matroid Intersection with Applications.”
On August 5, 2025, Tony Huynh from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on a natural extension of the multicolored version of the Erdős-Hajnal conjecture to projective geometries. The title of his talk was “Rainbow triangles and the Erdős-Hajnal problem in projective geometries“.
On July 29, 2025, Colin Geniet from the IBS Discrete Mathematics Group gave a talk on the merge-width of graphs and 𝜒-boundedness of graphs of bounded merge-width at the Discrete Math Seminar. The title of his talk was “merge-width“.
On July 22, 2025, Linda Cook from the University of Amsterdam gave a talk at the Discrete Math Seminar on the local certification protocol for monadic second-order property on graphs of bounded tree-width. The title of her talk was “A tight algorithmic meta-theorem for distributed certification within bounded treewidth graphs“.
On July 8, 2025, Mihyun Kang (강미현) from the TU Graz gave a talk at the Discrete Math Seminar on the random subgraph of a hypercube and the Cartesian product of regular graphs. The title of her talk was “Phase transitions in a random subgraph of the hypercube“.
On July 1, 2025, Sergey Norin from McGill University gave a talk at the Discrete Math Seminar on the asymptotic dimension of intersection graphs. The title of his talk was “Asymptotic dimension of intersection graphs“.