Predavatelj: Xuding Zhu – National Sun Yat-sen University, Tajvan

In this talk, I will briefly survey research on the parameter "the circular chromatic number" of a graph, which is a refinement of the chromatic number of a graph. I will concentrate on different methods of constructing graphs whose circular chromatic number is equal to a given number and which has required properties, such as having large girth, being planar, etc.