On October 26, 2021, Donggyu Kim (김동규) from KAIST & IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar, introducing 𝝘-graphic delta-matroids and showing their algorithmic applications. The title of his talk was “𝝘-graphic delta-matroids and their applications“.

## DIMAG had the online workshop “Young Researchers in Extremal and Probabilistic Combinatorics” on October 20-22, 2021.

On October 20-22, 2021, DIMAG had an online workshop “Young Researchers in Extremal and Probabilistic Combinatorics” organized by Tuan Tran and Casey Tompkins. There were 7 invited talks a day for three days.

## Invited Speakers & Program

### Oct. 20 Wednesday 4 PM (KST) – 8 PM (KST)

**Andrzej Grzesik**(Jagiellonian University): Degenerated generalized Turán numbers of cycles, 4:00-4:25**Jan Volec**(Czech Technical University): Existence of common graphs with large chromatic number, 4:30-4:55**Balázs Patkós**(Rényi Institute): Vector sum-intersection theorems, 5:00-5:25**István Tomon**(ETH Zurich): Small doubling, atomic structure and ℓ-divisible set families, 5:30-5:55**Michael Anastos**(Freie Universität Berlin): Longest Cycles in Sparse Random Graphs and Where to Find Them, 6:30-6:55**Adam Zsolt Wagner**(Tel Aviv University): Constructions in combinatorics via neural networks, 7:00-7:25**Yelena Yuditsky**(Université libre de Bruxelles): On multicolor Ramsey numbers and subset-coloring of hypergraphs, 7:30-7:55

### Oct. 21 Thursday 4 PM (KST) – 8 PM (KST)

**Kevin Hendrey**(IBS Discrete Mathematics Group): Extremal functions for sparse minors, 4:00-4:25**Simona Boyadzhiyska**(Freie Universität Berlin): Ramsey simplicity of random graphs, 4:30-4:55**Shagnik Das**(National Taiwan University): Schur’s Theorem in randomly perturbed sets, 5:00-5:25**Tony Huynh**(Monash University): Subgraph densities in minor-closed classes (and beyond), 5:30-5:55**Ander Lamaison**(Masaryk University): Hypergraphs with minimum uniform Turán density, 6:30-6:55**Ben Lund**(IBS Discrete Mathematics Group): Maximal 3-wise intersecting families, 7:00-7:25**Liana Yepremyan**(London School of Economics): Enumerating independent sets in Abelian Cayley graphs, 7:30-7:55

### Oct. 22 Friday 4 PM (KST) – 8 PM (KST)

**Andrey Kupavskii**(CNRS): Binary scalar products, 4:00-4:25**Dániel Gerbner**(Rényi Institute): Exact results for generalized Turán problems, 4:30-4:55**Oliver Janzer**(University of Cambridge): Tiling with monochromatic bipartite graphs of bounded maximum degree, 5:00-5:25**Nika Salia**(Rényi Institute): Pósa-type results for Berge Hypergraphs, 5:30-5:55**Debsoumya Chakraborti**(IBS Discrete Mathematics Group): Mixing time and expanders, 6:30-6:55**Wei-Tian Li**(National Chung Hsing University): Ramsey Properties for V-shaped Posets in the Boolean Lattices, 7:00-7:25**Dimitry Zakharov**(Moscow Institute of Physics and Technology): Zero subsums in vector spaces over finite fields, 7:30-7:55

## Joonkyung Lee (이준경) gave a talk about the majority dynamics on sparse random graphs at the Discrete Math Seminar

On October 12, 2021, Joonkyung Lee (이준경) from the Hanyang University gave a talk about the majority dynamics on sparse random graphs. The title of his talk was “Majority dynamics on sparse random graphs“.

## Paul Seymour gave an online talk on the polynomial 𝜒-boundedness of graph classes at the Virtual Discrete Math Colloquium

On October 8, 2021, Paul Seymour from Princeton University gave an online talk at the Virtual Discrete Math Colloquium on the polynomial 𝜒-boundedness of graph classes. The title of his talk was “Polynomial bounds for chromatic number“.

## Eunjin Oh (오은진) gave a talk on a parameterized complexity of the feedback vertex set problem on unit disk graphs at the Discrete Math Seminar

On October 5, 2021, Eunjin Oh (오은진) from POSTECH gave a talk at the Discrete Math Seminar on the parameterized complexity of the feedback vertex set problem on unit disk graphs at the Discrete Math Seminar. The title of her talk was “Feedback Vertex Set on Geometric Intersection Graphs“.

## Péter Pál Pach gave an online talk on the solution of the Alon-Jaeger-Tarsi conjecture at the Virtual Discrete Math Colloquium

On September 30, 2021, Péter Pál Pach from the Budapest University of Technology and Economics gave an online talk at the Virtual Discrete Math Colloquium on the solution of the Alon-Jaeger-Tarsi conjecture for all finite fields of size more than 61 but not equal to 79. The title of his talk was “The Alon-Jaeger-Tarsi conjecture via group ring identities“.