Johannes Carmesin gave an online talk on locally planar embeddability of graphs on a surface at the Virtual Discrete Math Colloquium

On May 12, 2021, Johannes Carmesin from the University of Birmingham gave an online talk at the Virtual Discrete Math Colloquium on the analogue of Whitney’s theorem for the locally planar embedding of graphs on a surface. The title of his talk was “A Whitney type theorem for surfaces: characterising graphs with locally planar embeddings“.

Mark Siggers gave a talk on the complexity of the list switch homomorphism problem for signed graphs at the Discrete Math Seminar

On May 11, 2021, Mark Siggers from the Kyungpook National University gave a talk at the Discrete Math Seminar about the complexity of deciding whether there is a list homomorphism from a signed graph G to another signed graph switching equivalent to H. The title of his talk was “The list switch homomorphism problem for signed graphs“.

Raul Lopes gave an online talk on the FPT algorithm for finding the cylindrical grid in a directed graph of large directed tree-width at the Virtual Discrete Math Colloquium

On May 6, 2021, Raul Lopes from Universidade Federal do Ceará gave an online talk at the Virtual Discrete Math Colloquium providing a fixed-parameter tractable algorithm to find a large cylindrical grid as a butterfly minor in a directed graph of large directed tree-width. The title of his talk was “Adapting the Directed Grid Theorem into an FPT Algorithm“.

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“.

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