On September 27, 2022, Alexander Clifton from the IBS Discrete Mathematics Group gave a talk on the existence of a monochromatic increasing sequence with all gaps in a fixed set in any coloring of the set of positive integers at the Discrete Math Seminar. The title of his talk was “Ramsey Theory for Diffsequences“.

## Sebastian Wiederrecht gave a talk on the minor obstruction to admitting a tree decomposition into graphs each having bounded genus after removing a bounded number of apex vertices at the Discrete Math Seminar

On September 13, 2022, Sebastian Wiederrecht from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on the minor obstruction to admitting a tree decomposition into graphs each having bounded genus after removing a bounded number of apex vertices and its application to the characterization of minor-closed graph classes admitting efficient algorithms to count perfect matchings. The title of his talk was “Killing a vortex“.

## Bjarne Schülke gave a talk on the proof of Frankl’s conjecture on a local version of Katona’s intersection theorem for large instances at the Discrete Math Seminar

On September 6, 2022, Bjarne Schülke from Caltech gave a talk at the Discrete Math Seminar on the proof of Frankl’s conjecture on a local version of Katona’s intersection theorem at the Discrete Math Seminar. The title of his talk was “A local version of Katona’s intersection theorem“.

## Welcome Nika Salia and Zixiang Xu, new members of the IBS Extremal Combinatorics and Probability Group

The IBS discrete mathematics group welcomes Dr. Nika Salia and Dr. Zixiang Xu (徐子翔), new research fellows at the IBS Extremal Combinatorics and Probability Group from September 1, 2022.

Dr. Nika Salia received his Ph.D. from the Central European University in 2021 under the supervision of Prof. Ervin Győri.

Dr. Zixiang Xu (徐子翔) received his Ph.D. from the Capital Normal University of China in 2022 under the supervision of Prof. Gennian Ge.