On February 23, 2021, Minki Kim (김민기) from the IBS discrete mathematics group presented a talk on the existence of a rainbow matching of size n in a family of 3n-3 matchings for n>2 at the Discrete Math Seminar. The title of his talk was “Rainbow paths and rainbow matchings“.

## David Wood gave an online talk on the maximum number of copies of a fixed forest in sparse graph classes at the Virtual Discrete Math Colloquium

On February 17, 2021, David Wood from Monash University gave an online talk at the Virtual Discrete Math Colloquium on the maximum number of copies of a fixed forest in various sparse graph classes. The title of his talk was “Tree densities of sparse graph classes“.

## Martin Ziegler gave a talk on the problem of encoding metric spaces for the complexity theory at the Discrete Math Seminar

On February 16, 2021, Martin Ziegler from KAIST gave a talk at the Discrete Math Seminar on the encoding problem of metric spaces from the perspective of the complexity theory. The title of his talk was “Quantitative Coding and Complexity Theory of Continuous Data“.

## Jie Ma (马杰) gave an online talk on the maximum number of edges in a 2-connected graph with no two cycles of the same length at the Virtual Discrete Math Colloquium

On February 10, 2021, Jie Ma (马杰) from the University of Science and Technology of China gave an online talk at the Virtual Discrete Math Colloquium about the resolution of a conjecture of Boros, Caro, Füredi, and Yuster on the maximum number of edges in a 2-connected graph without two cycles of the same length. The title of his talk was “Non-repeated cycle lengths and Sidon sequences“.

## Doowon Koh (고두원) gave a talk on the approach to an upper bound of the point-sphere incidences over the finite field from the restriction estimates for cones at the Discrete Math Seminar

On February 9, 2021, Doowon Koh (고두원) from Chungbuk National University gave a talk at the Discrete Math Seminar on the restriction conjecture for the cone in four dimensions and its applications to the upper bound on the point-sphere incidences in the field field setting. The title of his talk was “On the cone restriction conjecture in four dimensions and applications in incidence geometry“.

## Ron Aharoni gave an online talk on the colorful version of the KKM theorem and a method of dividing multiple cakes at the Virtual Discrete Math Colloquium

On February 3, 2021, Ron Aharoni from the Technion gave an online talk at the Virtual Discrete Math Colloquium about the colorful version of the KKM theorem on topology and the problem of fairly partitioning multiple cakes. The title of his talk was “Colorful KKM and multiple cakes division“.

Photo by Marcus Quigmire from Wikipedia. CC BY-SA 2.0