26.03.2012 Lecturer: dr. Marcin Anholcer (Poznan Univeristy of Economics, Poland) Title: Group irregularity strength of graphs. Abstract: We investigate the \textit{group irregularity strength} ($s_\mathcal{G}(G)$) of graphs, i.e. the smallest value of $s$ such that taking any Abelian group $\mathcal{G}$ of…
19.03.2012 Lecturer: dr. Oliver Schaudt (Universität zu Köln, Germany). Title: The Price of Connectivity for Vertex Cover Abstract: We study a graph parameter called the Price of Connectivity for Vertex Cover (PoC). It was recently introduced by Cardinal et al.…
12.03.2012 Lecturer: dr. Istvan Kovacs Title: The isomorphism problem for rose window graphs Abstract: For an integer n ≥ 3, and a, r ∈ {1, 2, …, n − 1} with r ≠ n/2, the rose window graph Rn (a,…
05.03.2012 Lecturer: dr. Marko Orel Title: The mathematics in computed tomography (CT) Abstract: In 1979, the Nobel Prize for Medicine and Physiology was awarded jointly to Allan McLeod Cormack and Godfrey Newbold Hounsfield, the two pioneering scientistengineers primarily…
27.02.2012 Lecturer: dr. Klavdija Kutnar Title: Cayley snarks Abstract: In this talk I will discuss the well-known conjecture that there are no snarks amongst Cayley graphs. I will present an innovative approach in solving this conjecture combining the theory of…
20.02.2012 Lecturer: dr. Vito Vitrih Title: Pythagorean-hodograph curves Abstract: Polynomial Pythagorean-hodograph curves (PH curves) have been introduced in 1990 by Farouki and Sakkalis. They are characterized by the property that their parametric speed, i.e., the derivative of the arc…
06.02.2012 Lecturer: Hiroki Koike Title: Isomorphic Tetravalent cyclic Haar graphs Abstract: Let S be a subset of the cyclic group Zn. The cyclic Haar graph H(Zn,S) is the bipartite graph with vertex set two copies of the cyclic group and…
30.01.2012 Lecturer: Alexander Vasilyev Title: Introduction to Sage. Examples of application to Graph theory Abstract: Sage (previously SAGE) is mathematical software with features covering many aspects of mathematics, including algebra, combinatorics, numerical mathematics, number theory, and calculus. In this talk…
23.01.2012 Lecturer: Samed Bajrić Title: Almost Perfect Nonlinear functions Abstract: In this talk we present some basic properties of Almost Perfect Nonlinear (APN) functions over finite field of characteristic 2 and investigate some open problems. We provide the characterizations of…