On June 17, 2025, Attila Jung from the Eötvös Loránd University, Hungary gave a talk at the Discrete Math Seminar on combining the fractional Helly theorem and the quantitative volume theorem on convex sets optimally. The title of his talk was “The Quantitative Fractional Helly Theorem“.
On-Hei Solomon Lo gave a talk on characterizing minor-minimal 3-connected non-Hamiltonian graphs at the Discrete Math Seminar
On June 10, 2025, On-Hei Solomon Lo from Tongji University in Shanghai gave a talk at the Discrete Math Seminar on characterizing minor-minimal 3-connected non-Hamiltonian graphs. The title of his talk was “Minors of non-hamiltonian graphs“.
Denys Bulavka gave a talk on the Erdős-Ko-Rado theorem for simplicial complexes at the Discrete Math Seminar
On June 4, 2025, Denys Bulavka from the Hebrew University of Jerusalem gave a talk at the Discrete Math Seminar on the maximum size of intersecting families of k-element facets in simplicial complexes. The title of his talk was “Strict Erdős-Ko-Rado Theorems for Simplicial Complexes“.
Meike Hatzel gave a talk on disproving Babai’s lonely coloring conjecture at the Discrete Math Seminar
On May 27, 2025, Meike Hatzel from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on the existence of a graph of arbitrary large girth and chromatic number admitting a proper edge coloring without a color appearing alone in any cycle. The title of her talk was “Counterexample to Babai’s lonely colour conjecture“.
Seokbeom Kim (김석범) gave a talk on the structure of tournaments without a fixed 5-vertex subtournament at the Discrete Math Seminar
On May 13, 2025, Seokbeom Kim (김석범) from KAIST and the IBS Discrete Mathematics Group gave a talk on the structure of tournaments without a fixed 5-vertex tournament and its applications to the dichromatic number at the Discrete Math Seminar. The title of his talk was “The structure of △(1, 2, 2)-free tournaments“.
Welcome Sarah Wajsbrot, a new graduate student of the IBS Discrete Mathematics Group
The IBS Discrete Mathematics Group welcomes Sarah Wajsbrot, a new graduate student of the Discrete Mathematics Group from May 6, 2025 until July 5, 2025. She is a Ph.D. student in computer science at Université de Lorraine. Her advisor is Xavier Goaoc.
Welcome Roohani Sharma, a new member of the Discrete Mathematics Group
The IBS discrete mathematics group welcomes Dr. Roohani Sharma, a new research fellow at the IBS Discrete Mathematics Group from May 1, 2025. She received her Ph.D. from the Institute of Mathematical Sciences, Chennai, India, under the supervision of Prof. Saket Saurabh. She is interested in parameterized complexity and kernelization. Previously, she was a researcher at the University of Bergen, Norway, and a Lise-Meitner Post-doctoral Fellow at the Max Planck Institute for Informatics in Germany.
Welcome Ho Kim (김호), a new graduate student of the IBS Discrete Mathematics Group
The IBS Discrete Mathematics Group welcomes Ho Kim (김호), a new graduate student of the Discrete Mathematics Group from May 1, 2025. He received his B.S. degree from Hanyang University and entered the Department of Mathematical Sciences at KAIST as a graduate student on September 2024. His advisor is Jaehoon Kim (김재훈).
Eunjin Oh (오은진) gave a talk on an almost linear-time approximation algorithm for the minimum-weight b-edge cover on geometric complete bipartite graphs at the Discrete Math Seminar
On April 29, 2025, Eunjin Oh (오은진) from POSTECH gave a talk at the Discrete Math Seminar on an almost linear-time approximation algorithm for the minimum-weight b-edge cover on geometric complete bipartite graphs. The title of her talk was “Approximation Algorithms for the Geometric Multimatching Problem“.
Pascal Schweitzer gave a talk on finding symmetries and deciding isomorphic graphs at the Discrete Math Seminar
On April 28, 2025, Pascal Schweitzer from the Technical University of Darmstadt gave a talk on finding symmetries and deciding isomorphic graphs at the Discrete Math Seminar. The title of his talk was “Recent insights surrounding combinatorial approaches to isomorphism and symmetry problems“.