On December 12, 2019, Hong Liu from University of Warwick gave a talk on the resolution of the conjecture of Mader on the existence of a complete topological minor under the condition of average degree for C4-free graphs at the discrete math seminar held at KAIST. The title of his talk was “A proof of Mader’s conjecture on large clique subdivisions in $C_4$-free graphs“.

## Jakub Gajarský gave a talk on the class of graphs of structurally bounded expansion at the discrete math seminar

On December 10, 2019, Jakub Gajarský from Technische Universität Berlin presented a talk on the class of graphs of structurally bounded expansion and its relationship to the low shrubdepth covers. The title of his talk was “First-order interpretations of bounded expansion classes“.

## Frédéric Meunier gave a talk about new bounds on orthogonality dimension of graphs at the discrete math seminar

On November 21, 2019, Frédéric Meunier from École Nationale des Ponts et Chaussées, Paris presented a talk on the orthogonal representations and the orthogonality dimension of graphs at the discrete math seminar. The title of his talk was “Topological bounds for graph representations over any field“.

## Ruth Luo gave a talk on the induced Turán-type problems for hypergraphs at the discrete math seminar

On November 19, 2019, Ruth Luo from University of California San Diego gave a talk on the Turán-type results on r-uniform hypergraphs without a certain structure called an induced Berge-F. The title of her talk was “Induced Turán problems for hypergraphs“. She is visiting IBS discrete mathematics group until November 22.

## Tony Huynh gave a talk on the maximum weight stable set problem on graphs with bounded number of disjoint odd cycles at the Discrete Math Seminar

On November 12, Tony Huynh from Monash University gave a talk on the maximum weight stable set problem on graphs with bounded odd cycle packing number. The title of his talk was “Stable sets in graphs with bounded odd cycle packing number“.

## Pascal Gollin gave a talk on the existence of a decomposition of an infinite graph into spanning trees at the discrete math seminar

On October 29, 2019, Pascal Gollin from IBS discrete mathematics group gave a talk on the existence of a decomposition of an infinite graph into spanning trees in terms of the existence of packing and covering of spanning trees at the discrete math seminar. The title of his talk was “A Cantor-Bernstein-type theorem for spanning trees in infinite graphs“.

## Joonkyung Lee (이준경) presented a recent work on weakly norming and norming graphs at the discrete math seminar

On October 22, 2019, Joonkyung Lee (이준경) from University of Hamburg gave a talk based on his recent work on weakly norming and norming graphs. The title of his talk was “On some properties of graph norms“.

## Zi-Xia Song (宋梓霞) gave a talk on Ramsey numbers under Gallai colorings at the discrete math seminar

On October 15, 2019, Prof Zi-Xia Song (宋梓霞) from University of Central Florida (UCF) presented a talk about Ramsey numbers under Gallai colorings. The title of her talk was “Ramsey numbers of cycles under Gallai colorings.”

## Alexandr V. Kostochka gave a talk on a problem related to the graph reconstruction conjecture at the discrete math seminar

On October 10, 2019, Prof. Alexandr V. Kostochka from the University of Illinois at Urbana-Champaign gave a talk at the discrete math seminar. The title of his talk was “Reconstructing graphs from smaller subgraphs“.

## Alexandr V. Kostochka gave a colloquium talk on Ramsey-type problems for paths and cycles at the KAIST MathSci – IBS DIMAG Joint Colloquium

On October 8, 2019, Prof. Alexandr V. Kostochka from the University of Illinois at Urbana-Champaign gave a colloquium talk at the KAIST Mathematical Sciences – IBS Discrete Mathematics Group Joint Colloquium. The title of his talk was “On Ramsey-type problems for paths and cycles in dense graphs“. He will stay one week at IBS Discrete Mathematics Group.