Jack Koolen（POSTECH）「On t-walk-regular graphs」
Fiol and Garriga introduced the term t-walk-regular graphs, generalizing walk-regular graphs as introduced by Godsil and McKay. t-Walk-rgular graph generalize distance-regular graphs. In this talk I will discuss what theory on distance-regular graphs can be generalized to mainly 2-walk-regular graphs. This is work in progress with E.van Dam, M. Camara and J. Park.