News

April 15, 2025April 15, 2025

Nicola Lorenz gave a talk on the existence of a normal tree spanning a given set of vertices in an infinite graph in terms of the coloring number of rooted minors at the Discrete Math Seminar

On April 15, 2025, Nicola Lorenz from the University of Hamburg gave a talk on the existence of a normal tree spanning a given set of vertices in an infinite graph in terms of the coloring number of rooted minors at the Discrete Math Seminar. The title of her talk was “A Minor Characterisation of Normally Spanned Sets of Vertices“.

April 14, 2025April 14, 2025

Daniel McGinnis gave a talk at the Discrete Math Seminar on determining the existence of a k-dimensional affine subspace intersecting every member of a given finite family of convex sets in the d-dimensional real space

On April 14, 2025, Daniel McGinnis from Princeton University gave a talk on determining the existence of a k-dimensional affine subspace intersecting every member of a given finite family of convex sets in the d-dimensional real space at the Discrete Math Seminar. The title of his talk was “A necessary and sufficient condition for k-transversals“.

April 9, 2025April 9, 2025

Marcelo Garlet Milani gave a talk on the directed grid theorem at the Discrete Math Seminar

On April 8, 2025, Marcelo Garlet Milani from NII, Japan gave a talk at the Discrete Math Seminar on an alternative proof of the directed grid theorem. The title of his talk was “Cycles of Well-Linked Sets and an Elementary Bound for the Directed Grid Theorem“.

April 1, 2025April 1, 2025

Hyunwoo Lee (이현우) gave a talk on determining the matching polynomial of k-uniform hypergraphs from the list of all induced subhypergraphs of fixed size at the Discrete Math Seminar

On April 1, 2025, Hyunwoo Lee (이현우) from KAIST and IBS Extremal Combinatorics and Probability Group gave a talk at the Discrete Math Seminar on the problem of determinining the matching polynomial of k-uniform hypergraphs from the list of all induced subhypergraphs of fixed size. The title of his talk was “Reconstructing hypergraph matching polynomials“.

March 18, 2025March 18, 2025

Michał T. Seweryn gave a talk on the existence of Kelly’s poset in a poset of sufficient large dimension with a planar cover graph at the Discrete Math Seminar

On March 18, 2025, Michał T. Seweryn from Charles University gave a talk at the Discrete Math Seminar showing that every poset of very large dimension with a planar cover graph has Kelly’s poset of large dimension. The title of his talk was “Dimension and standard examples in planar posets“.

March 11, 2025March 11, 2025

Johannes Carmesin gave a talk at the Discrete Math Seminar on open problems related to temporal graphs and connectivity augmentations

On March 11, 2025, Johannes Carmesin from TU Freiberg gave a talk on open problems related to temporal graphs and connectivity augmentations at the Discrete Math Seminar. The title of his talk was “Open problems in graph theory“.

March 4, 2025March 4, 2025

Irene Muzi gave a talk on obtaining a better bound for the Erdős-Pósa property of directed cycles at the Discrete Math Seminar

On March 4, 2025, Irene Muzi from the University of Hamburg gave a talk at the Discrete Math Seminar on obtaining a better bound for the Erdős-Pósa property of directed cycles. The title of her talk was “An elementary bound for Younger’s conjecture“.

February 26, 2025February 26, 2025

Sepehr Hajebi gave a talk on unavoidable induced subgraphs of graphs of large path-width at the Discrete Math Seminar

On February 25, 2025, Sepehr Hajebi from the University of Waterloo gave a talk at the Discrete Math Seminar on unavoidable induced subgraphs of graphs of large path-width. The title of his talk was “The pathwidth theorem for induced subgraphs“.

February 22, 2025February 22, 2025

Sebastian Wiederrecht gave lectures during the third week of the IBS-DIMAG School on Graph Minors

From February 17 to 19, 2025, the third and last week of the IBS-DIMAG Winter School on Graph minors took place at IBS with lectures by Sebastian Wiederrecht from KAIST. He gave lectures on explaining tangles, sketching the proof of the Graph Minor Structure Theorem of Robertson and Seymour, and presenting the key idea of improving the bounds (for vortices and apices) to polynomials.

This school was held for three consecutive weeks from February 3, 2025.

February 18, 2025February 18, 2025

O-joung Kwon (권오정) gave a talk at the Discrete Math Seminar on the Erdős-Pósa property of A-paths in group-labelled graphs

On February 18, 2025, O-joung Kwon (권오정) from Hanyang University gave a talk on the condition for the existence of disjoint A-paths in group-labelled graphs at the Discrete Math Seminar. The title of his talk was “Erdős-Pósa property of A-paths in unoriented group-labelled graphs“.