On February 18, 2020, Dong Yeap Kang from KAIST & IBS Discrete Mathematics Group gave a talk on random perturbed graphs. The title of his talk is “Fragile minor-monotone parameters under random edge perturbation“. Dong Yeap will receive the Ph.D. degree at the end of this month from KAIST and will move to University of Birmingham, UK as a postdoc.

## The registration for the conference “Seymour is Seventy” (June 15-19) is now open! The deadline for early bird registration is April 12, 2020.

The registration for the conference “Seymour is Seventy” is now open.

- Deadline for early bird registration : April 12, 2020.
- Registration fees : 250 euros (includes coffee breaks, lunches, and the banquet)
- For accompanying persons, it is possible to register only for the banquet for 70 euros
- To register, follow the link from the website https://dimag.ibs.re.kr/seymour70/

The website also has a list of suggested hotels in Lyon.

## Seymour is Seventy

A conference honouring the seventieth birthday of Paul Seymour

At ENS de Lyon, France

From June 15th to June 19th, 2020.

## Invited speakers

Noga Alon, Princeton University / Tel Aviv University

Maria Chudnovsky, Princeton University

Julia Chuzhoy, Toyota Technological Institute at Chicago

Gérard Cornuéjols, Carnegie Mellon University

Matt DeVos, Simon Fraser University

Guoli Ding, Louisiana State University

Jacob Fox, Stanford University

Jim Geelen, University of Waterloo

András Gyárfás, Hungarian Academy of Sciences

Alexandr V. Kostochka, University of Illinois at Urbana-Champaign

Chun-Hung Liu, Texas A&M University

Sergey Norin, McGill University

Sang-il Oum, IBS Discrete Mathematics Group / KAIST

Bruce Reed, McGill University

Alexander Schrijver, University of Amsterdam / CWI Amsterdam

Alex Scott, University of Oxford

Sophie Spirkl, Princeton University

Benny Sudakov, ETH Zurich

Stéphan Thomassé, ENS de Lyon

Carsten Thomassen, Technical University of Denmark

Kristina Vušković, University of Leeds

Paul Wollan, University of Rome “La Sapienza”

## Dillon Mayhew gave a talk on analogues of Courcelle’s theorem, in particular to hypergraphs and matroids at the discrete math seminar

On January 28, 2020, Dillon Mayhew from Victoria University of Wellington, New Zealand gave a talk on problems and results motivated by Courcelle’s theorem, with an emphasis on hypergraphs and matroids. The title of his talk is “Courcelle’s Theorem for hypergraphs“.

## Adam Zsolt Wagner gave a talk on an extremal problem in Z_{2^n} at the discrete math seminar

On January 20, 2020, Adam Zsolt Wagner from ETH Zurich gave a talk on the largest subset of $\mathbb Z_{2^n}$ having no projective $d$-cube. The title of his talk was “The largest projective cube-free subsets of $Z_{2^n}$“. He has been visiting IBS discrete mathematics group for a week and will leave on this Wednesday.

## Ben Lund gave a talk on the problem on Furstenberg sets over field fields related to the Kakeya conjecture at the discrete math seminar

On January 15, 2020, Ben Lund from Princeton University gave a talk about a generalization of the Kakeya conjecture posed by Ellenberg, Oberlin, and Tao. The title of his talk was “Furstenberg sets over finite fields“. He is visiting the IBS discrete mathematics group until January 21, Tuesday.

## Sanjeeb Dash gave a talk on the integer programming approach to the interpretable machine learning at the discrete math seminar

On January 14, 2020, Sanjeeb Dash from IBM T. J. Watson Research presented a talk on the integer programming formulation for the problem arising from the interpretable machine learning. The title of his talk was “Boolean decision rules via column generation“. He is visiting IBS Discrete Mathematics Group until the end of this week.

## Welcome Sounggun Wee (위성군), a new graduate student in the IBS discrete mathematics group

The IBS discrete mathematics group welcomes **Sounggun Wee (위성군)**, a new graduate student at the IBS discrete mathematics group since January 2020. He is currently a graduate student at the department of mathematical sciences, KAIST.

## Jaiung Jun (전재웅) presented a talk on the Hall algebra of the category of matroids at the discrete math seminar

On December 26, Thursday, Jaiung Jun (전재웅) from SUNY New Paltz gave a talk at the discrete math seminar held at KAIST. The title of his talk was “The Hall algebra of the category of matroids“.

## Attila Joó gave a talk on the partition of a set into bases of finitary matroids and cofinitary matroids at the discrete math seminar

On December 19, 2019, Attila Joó from University of Hamburg presented a talk on the partitioning of the ground set into bases of finitary and cofinitary matroids at the discrete math seminar. The title of his talk was “Base partition for finitary-cofinitary matroid families”.

## Hong Liu gave a talk on the conjecture of Mader about the topological minors in C4-free graphs at the discrete math seminar

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“.