Combinatorics: Joel Friedman (UBC) "Open Problems Related to the Zeta Functions"

Speaker: Joel Friedman, UBC Title: Open Problems Related to the Zeta Functions Abstract: We express some open problems in graph theory in terms of Ihara graph zeta functions, or, equivalently, non-backtracking matrices of graphs. We focus on "expanders" and random regular graphs, but touch on some seemingly unrelated problems encoded in zeta functions. We suggest that zeta functions of sheaves on graphs may have relevance to complexity theory and to questions of Stark and Terras regarding whether coverings of a fixed graph can ramify like number field extensions. This talk assumes only basic linear algebra and graph theory. Part of the material is joint work with David Kohler and Doron Puder.


Mon, 14/05/2018 - 11:00 to 12:30


IIAS, Eilat hall, Feldman bldg, Givat Ram