2022-05-19 18:00 – 19:00 ZOOM (See link below) Tomaž Pisanski, University of Primorska, Slovenia More questions than answers about nut graphs Singular graphs of nullity one admitting a full kernel eigenvector are called nut graphs. Nut graphs constitute a fascinating…
2021-11-04 18:00 – 19:00 ZOOM (See link below) Niko Tratnik, University of Maribor, Slovenia Generalized Cut Method Applied to Some Distance-Based Topological Indices The cut method has an important role in the investigation of molecular descriptors. Very often it was…
2021-10-14 18:00 – 19:00 ZOOM (See link below) Dragan Stevanović, Mathematical Institute of the Serbian Academy of Sciences and Arts, Serbia On Hosoya’s dormants and sprouts The study of cospectral graphs is one of the traditional topics of spectral graph…
2021-06-17 18:00 – 19:00 ZOOM (See link below) Dragan Stevanović, Mathematical Institute of the Serbian Academy of Sciences and Arts, Serbia On circulant nut graphs A nut graph is a simple graph whose adjacency matrix has the eigenvalue 0 with…
2021-04-22 18:00 – 19:00 ZOOM (See link below) Vesna Andova, Ss. Cyril and Methodius University, Macedonia Distance based indices on nanotubical graphs Nanotubical graphs are obtained by wrapping a hexagonal grid into a cylinder, and then possibly closing the tube…
2021-04-08 18:00 – 19:00 ZOOM (See link below) Irene Sciriha, University of Malta, Malta On the walks, coverings, symmetry and conductivity of graphs with the same main eigenspace The canonical double cover (CDC) of a graph G is the direct…
2021-03-18 18:00 – 19:00 ZOOM (See link below) Tomislav Došlić, University of Zagreb, Croatia, and Faculty of Information Studies, Novo mesto, Slovenia Perfect packings of small graphs into classical and generalized fullerenes A perfect packing of a graph H into…
2021-03-11 17:00 – 18:00 ZOOM (See link below) Daniel Merkle and Nikolai Nøjgaard, University of Southern Denmark, Denmark Canonicalisation of Chemical Graphs and Non-Isomorphic 1-Face Embeddings Finding solutions for problems in chemistry and biology often entails the enumeration of objects…
2021-02-18 18:00 – 19:00 ZOOM (See link below) Peter F. Stadler, University of Leipzig, Germany Later Divergence Time graphs Reconciliations of trees, that is, mappings μ: V(T) → V(S) ∪ E(S) from a rooted tree T, the gene tree, into…
2021-02-04 18:00 – 19:00 ZOOM (See link below) Marc Hellmuth, Stockholm University, Sweden The mathematics of Horizontal Gene Transfer and Fitch’s xenology relation Horizontal Gene Transfer (HGT) is the movement of genetic material between coexisting species. Given the true history…