On May 26, 2020, Hong Liu from University of Warwick presented a talk on his recent work describing approximate structures of an n-vertex m-edge graph minimizing the number of cliques of size k. The title of his talk was “Asymptotic Structure for the Clique Density Theorem”.

## O-joung Kwon (권오정) gave a survey talk on the MIM-width of graphs at the Discrete Math Seminar

On May 19, 2020, O-joung Kwon (권오정) from Incheon National University and IBS Discrete Mathematics Group presented a survey talk on the MIM-width of graphs. The title of his talk was “Mim-width: a width parameter beyond rank-width“.

## Eun Jung Kim (김은정) gave a talk on the twin-width at the Discrete Math Seminar

On May 12, 2020, Eun Jung Kim (김은정) from LAMSADE, CNRS presented a talk on her recent work on the twin-width. The title of her talk was “Twin-width: tractable FO model checking“. She is visiting the IBS discrete mathematics group from May 12 for about 4 months.

## Seunghun Lee (이승훈) gave a talk on the complexes of subgraphs having no large matching at the Discrete Math Seminar

On April 28, 2020, Seunghun Lee (이승훈) from KAIST presented a talk on the topological property of the non-matching complex, that is a simplicial complex consisting of subgraphs on the same vertex set having no matching of size k and its application to the rainbow matching problem of graphs. The title of his talk is “Leray numbers of complexes of graphs with bounded matching number“.

## Sang-il Oum gave a survey talk on vertex-minors of graphs at the Discrete Math Seminar

On April 21, 2020, Sang-il Oum gave a survey talk on vertex-minors of graphs at the discrete math seminar. The title of his talk was “survey on vertex-minors“.

## Casey Tompkins gave a talk on the saturation problems in the context of Erdős-Szekeres theorems and posets at the Discrete Math Seminar

On April 14, 2020, Casey Tompkins from IBS discrete mathematics group gave a talk on the saturation version of the problems related to the Erdős-Szekeres theorem on convex k-gons, sequences, and posets. The title of his talk is “Saturation problems in the Ramsey theory of graphs, posets and point sets“.

## Pascal Gollin gave a talk on variants of Woodall’s conjecture at the Discrete Math Seminar

On April 7, 2020, Pascal Gollin presented his work on the relation between the packing of edge sets intersecting all directed cuts in some class B and the maximum size of a minimal nonempty directed cut in B, motivated by Woodall’s conjecture. The title of his talk is “Disjoint dijoins for classes of dibonds in finite and infinite digraphs“.

## Ringi Kim (김린기) gave a talk on the strong clique number of graphs at the Discrete Math Seminar

On March 31, 2020, Ringi Kim (김린기) from KAIST presented his work on the strong clique number of graphs with Eun-Kyung Cho, Ilkyoo Choi, and Boram Park. The title of his talk is “The strong clique number of graphs with forbidden cycles“.

## Kevin Hendrey gave a talk on covering the space of permutations by Hamming balls of small radius at the Discrete Math Seminar

On March 24, 2020, Kevin Hendrey from IBS discrete mathematics group presented a talk on his work on covering the Hamming permutation space by balls of small radius. The title of his talk was “Covering radius in the Hamming permutation space“.

## Dabeen Lee (이다빈) gave a talk on the generalization of the Chvátal-Gomory closure at the Discrete Math Seminar

On March 17, 2020, Dabeen Lee (이다빈) from IBS discrete mathematics group presented a talk on his result proving that the closure of a polyhedron by some generalization of the Chvátal-Gomory cuts gives a polyhedron. The title of his talk is “On a generalization of the Chvátal-Gomory closure“.