2013-12-23 10:00-11:00 FAMNIT-SEMIN Bojan Kuzma When Hadamard and usual powers coincide? We classify real matrices where the standard power coincides with the Hadamrad entry-wise. The problem appeared recently in vol 51 of IMAGE journal. Time permitting we will present some further problems from…
2013-12-16 10:00-11:00 FAMNIT-SEMIN Tomaž Pisanski Combinatorial configurations, quasiline arrangements and systems of curves on surfaces It is well known that not every combinatorial configuration admits a geometric realization with points and lines. Moreover, some of them do not admit even realizations with…
2013-12-09 10:00-11:00 FAMNIT-SEMIN Dr. Jicheng Ma Arc-transitive regular covers of cubic graphs In this talk, I will briefly remind you the two known approaches for classifying arc-transitive abelian or elementary abelian covering graphs. Also I’ll introduce some of my recent work…
2013-12-02 10:00-11:00 FAMNIT-POŠTA Sergio Hiroki Koike Quintanar On the isomorphism problem of cyclic Haar graphs
2013-11-25 10:00-11:00 FAMNIT-SEMIN prof. dr. Primož Potočnik (UL FMF and UP IAM) How many automorphisms can a graph have? The topic of the talk will be finite connected graphs admitting an automorphism group that acts transitively on the arcs of the…
2013-11-18 10:00-11:00 FAMNIT-SEMIN Ratko Darda Bounds on the Product Irregularity Strength of Graphs For a graph X with at most one isolated vertex and without isolated edges, a product irregular labeling, is a labeling of its edges with the values…
2013-11-11 10:00-11:00 FAMNIT-SEMIN Anja Komatar Second Neighbourhood Conjecture Second Neighbourhood Conjecture states that every oriented graph has a vertex with second neighbourhood at least as large as first. We show that if a counterexample exists, it has a large minimal…
2013-10-28 10:00-11:00 FAMNIT-SEMIN Primož Lukšič (UP IAM and Abelium). Growth in graphs The concepts of adjacency and distance are two of the most basic terms in graph theory. A natural generalization leads to the notion of distance degree which tells…
2013-10-23 12:00-13:00 FAMNIT-SEMIN Michal Zajac (Slovak University of Technology, Bratislava, Slovakia) Invariant subspace problem and hyperreflexivity Download the abstract.
2013-10-21 10:00 – 12:00 Muzejski 2 Ademir Hujdurović (UP IAM, UP FAMNIT) PhD Thesis defence The thesis contains number of different topics in algebraic graph theory, touching and resolving some open problems that have been a center of research interest…