On January 25, 2022, O-joung Kwon (권오정) from the Incheon National University / IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on upper bounds of the twin-width and reduced-bandwidth of planar graphs and H-minor-free graphs at the Discrete Math Seminar. The title of his talk was “Reduced bandwidth: a qualitative strengthening of twin-width in minor-closed classes (and beyond)“.

## Ken-ichi Kawarabayashi gave an online talk on the recent progress towards the directed graph minor theory at the Virtual Discrete Math Colloquium

On January 20, 2022, Ken-ichi Kawarabayashi from the National Institute of Informatics, Japan gave an online talk at the Virtual Discrete Math Colloquium on the recent progress towards the directed graph minor theory. The title of his talk was “Toward Directed Graph Minor Theory“.

## Jaehyeon Seo (서재현) gave a talk on the rainbow Turán problem for color-critical graphs at the Discrete Math Seminar

On January 18, 2022, Jaehyeon Seo (서재현) from KAIST gave a talk at the Discrete Math Seminar on the rainbow Turán problem for color-critical graphs. The title of his talk was “A rainbow Turán problem for color-critical graphs“.

## Ron Aharoni gave an online talk at the Virtual Discrete Math Colloquium about a stronger version of the Caccetta-Haggkvist conjecture

On January 13, 2022, Ron Aharoni from the Technion gave an online talk at the Virtual Discrete Math Colloquium on a stronger version of the Caccetta-Haggkvist conjecture and recent results. The title of his talk was “A strong version of the Caccetta-Haggkvist conjecture“.

## Andreas Holmsen gave a talk about a counterexample to the Bárány-Kalai conjecture on line transversals of a finite family of convex sets at the Discrete Math Seminar

On January 11, 2022, Andreas Holmsen from KAIST gave a talk at the Discrete Math Seminar about the counterexample to the Bárány-Kalai conjecture on line transversals of a finite family of convex sets. The title of his talk was “Some recent results on geometric transversals“.

## Seunghun Lee (이승훈) gave a talk on the transversal number and the chromatic number of hypergraphs consisting of facets of a simplicial sphere at the Discrete Math Seminar

On January 4, 2022, Seunghun Lee (이승훈) from the Binghamton University gave a talk at the Discrete Math Seminar on the transversal number and the chromatic number of hypergraphs whose edges are facets of a simplicial sphere. The title of his talk was “Transversals and colorings of simplicial spheres“.

## Dabeen Lee (이다빈) received the Excellence Award from the president of IBS

On January 3, 2022, Dabeen Lee from the IBS Discrete Mathematics Group received the Excellence Award from the president of IBS. Congratulations!