2014-10-27 10:00-10:45 FAMNIT-SEMIN Istvan Kovacs (UP FAMNIT) Finite CI-groups and Schur rings A Cayley graph Cay(G,S) is called a CI-graph if for every subset Tof G, if Cay(G,T) and Cay(G,S) are isomorphic, then T=f(S) for some automorphism f of G.…
2014-10-20 10:00-10:45 FAMNIT-SEMIN Ademir Hujdurović Generalized Cayley graphs Generalized Cayley graphs were defined by D.Marušič, R. Scapellato and N. Zagaglia Salvi in 1992. They studied properties of such graphs, mostly related to double coverings of graph. They also posed a…
2014-10-13 10:00-10:45 FAMNIT-SEMIN György Pál Gehér (University of Szeged and University of Debrecen, Hungary) A two dimensional matrix problem of Molnar and Timmermann and its connection to a geometric problem problem of Rassias and Wagner Download abstract. Download slides.
2014-10-06 10:00-11:00 FAMNIT-SEMIN Dr. Flavia Bonomo (Buenos Aires University, Argentina) Minimum weight clique cover in claw-free perfect graphs For a perfect graph G, and given a weight function w on the vertices of G, linear programming duality ensures that the weight of…
2014-10-06 11:00-12:00 FAMNIT-SEMIN Dr. Pablo De Caria (National University of La Plata, Argentina) On chordal and dually chordal graphs and their tree representations Chordal and dually chordal graphs are well known classes, whose duality becomes evident by the use of…
2014-09-29 10:00-11:00 FAMNIT-SEMIN Dr Matthew Johnson (Durham University, UK) Finding (Shortest) Paths between Graph Colourings The reconfiguration graph of the $k$-colourings of a graph $G$ contains as its vertex set the proper vertex $k$-colourings of $G$, and two colourings are…
2014-06-16 10:00-12:00 FAMNIT-MP Janez Povh (Fakulteta za informacijske študije v Novem mestu) Kaj imata skupnega kombinatorična optimizacija in realna algebraična geometrija V kombinatorični optimizaciji se ukvarjamo z iskanjem optimuma linearne ali kvadratične funkcije nad končno množico, ki pa je praviloma…
2014-06-02 10:00-11:00 FAMNIT-SEMIN Dr. Russ Woodroofe ( Mississippi State University, USA) Noncontractibility of the coset lattice and fixed points of group actions Ken Brown asked whether there is any group G such that the coset lattice of G is contractible.…
2014-06-09 10:00-11:00 FAMNIT-SEMIN Slobodan Danko Bosanac (Ruđer Bošković Institute, Croatia) Verifiable information: the problem of communication Exchange of information occurs on all levels of living matter, and it is the basis without which life could not be developed, especially on the…
2014-06-11 11:00-12:00 FAMNIT-VP prof. dr. Robin Wilson (Open University, United Kingdom) A CENTURY OF GRAPH THEORY Graph theory has changed completely from the late-19th century to the late 20th century, from a collection of mainly recreational problems to a well-developed…