Reinhard Diestel gave an online talk on various applications of the abstract tangle theory at the Virtual Discrete Math Colloquium

On April 21, 2021, Reinhard Diestel from the University of Hamburg gave an online talk at the Virtual Discrete Math Colloquium about the abstract tangle theory and its applications to real-world examples such as clustering. The title of his talk was “Tangles of set separations: a novel clustering method and type recognition in machine learning“.

Michał Pilipczuk gave an online talk on the structural properties of powers of graphs in a class of bounded expansion or in a nowhere dense class at the Virtual Discrete Math Colloquium

On April 7, 2021, Michał Pilipczuk from the University of Warsaw gave an online talk at the Virtual Discrete Math Colloquium on the structural properties of powers of graphs in a fixed class of of graphs of bounded expansion or a fixed nowhere-dense class of graphs. The title of his talk was “Structural properties of powers of sparse graphs“.

Rutger Campbell gave a talk on the hardness of deciding the real representability of complex-representable orientable matroids at the Discrete Math Seminar

On April 6, 2021, Rutger Campbell from the IBS Discrete Mathematics Group gave a talk at the Discrete Math Seminar on the difficulty of deciding whether a matroid given by the independence oracle is representable over the reals even if the matroid is representable over the complex field and is orientable. The title of his talk was “Matroid orientability and representability“.