On April 30, 2024, Maximilian Gorsky from the Technische Universität Berlin gave a talk on the quarter-integral and third-integral Erdős-Pósa property for even directed cycles at the Discrete Math Seminar. The title of his talk was “Towards the half-integral Erdős-Pósa property for even dicycles“.

## Víctor Dalmau gave a talk on the right adjoints of Datalog Programs at the Discrete Math Seminar

On April 23, 2024, Víctor Dalmau from the Universitat Pompeu Fabra in Barcelona gave a talk at the Discrete Math Seminar on the right adjoints of Datalog Programs. The title of his talk was “Right-adjoints of Datalog Programs“.

## Magnus Wahlström gave a talk on various algorithmic aspects of linear delta-matroids at the Discrete Math Seminar

On April 16, 2024, Magnus Wahlström from Royal Holloway, University of London gave a talk at the Discrete Math Seminar on various algorithmic aspects of linear delta-matroids. The title of his talk was “Algorithmic aspects of linear delta-matroids“.

## Eero Räty gave a talk on lower bounds for the positive discrepancy of graphs of average degree d at the Discrete Math Seminar

On April 9, 2024, Eero Räty from Umeå University gave a talk at the Discrete Math Seminar on lower bounds for the positive discrepancy of graphs of average degree d. The title of his talk was “Positive discrepancy, MaxCut and eigenvalues of graphs.” He is currently visiting the IBS Extremal Combinatorics and Probability Group for 2 months.

## Casey Tompkins gave a talk on the maximum number of edges in a graph without cycles of length 0 mod 4 at the Discrete Math Seminar

On April 2, 2024, Casey Tompkins from the Alfréd Rényi Institute of Mathematics gave a talk at the Discrete Math Seminar on the maximum number of edges in a graph without cycles of length 0 mod 4. The title of his talk was “On graphs without cycles of length 0 modulo 4“.

## Evangelos Protopapas gave a talk on characterizing minor-closed classes of graphs satisfying the Erdős-Pósa properties for minors at the Discrete Math Seminar

On March 26, 2024, Evangelos Protopapas from LIRMM gave a talk at the Discrete Math Seminar on characterizing minor-closed classes of graphs satisfying the Erdős-Pósa properties for minors. The title of his talk was “Erdős-Pósa Dualities for Minors“.

## Linda Cook gave a talk on bounding the average degree of a graph with no subgraph isomorphic to a fixed complete bipartite subgraph or a subdivision of a fixed graph at the Discrete Math Seminar

On March 12, 2024, Linda Cook from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar about bounding the average degree of a graph with no subgraph isomorphic to a fixed complete bipartite graph or a subdivision of a fixed graph by a polynomial function of the size of the complete bipartite graph. The title of her talk was “On polynomial degree-boundedness“.

## William Cook gave a colloquium talk on the Traveling Salesman Problem

On March 6, 2024, William Cook from the University of Waterloo gave a colloquium talk on the Traveling Salesman Problem. The title of his talk was “The Traveling Salesman Problem: Amazon Deliveries, Pub Walks, and Astro Tours“.

## Jie Han gave a talk on the complexity of deciding the existence of a perfect matching in k-uniform hypergraphs under various degree conditions at the Discrete Math Seminar

On February 27, 2024, Jie Han (韩杰) from the Beijing Institute of Technology gave a talk at the Discrete Math Seminar on the complexity of deciding the existence of a perfect matching in k-uniform hypergraphs under various degree conditions. The title of his talk was “Perfect matchings in dense uniform hypergraphs“. Jie Han will stay at IBS for two months.

## Sebastian Wiederrecht gave a talk on the 1/4-integral Erdős-Pósa property of even directed cycles at the Discrete Math Seminar

On February 14, 2024, Sebastian Wiederrecht from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar, showing that the even directed cycles have the 1/4-integral Erdős-Pósa property. The title of his talk was “Packing even directed circuits quarter-integrally“.