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Lethbridge Number Theory and Combinatorics Seminar
Date:
February 6, 2017
Time:
12:00-12:50pm
Lecturer(s):
Joy Morris
Location:
University of Lethbridge
Topic:
Oriented Regular Representations
Description (in plain text format):
An oriented graph is a digraph with at most one arc between any pair of vertices.
We say that the action of a group on a set of points is regular if it is sharply transitive; that is, there is exactly one group element mapping any point to any other point. An oriented regular representation (ORR) for a group G is an oriented graph whose automorphism group is isomorphic to the regular action of G on the vertices. In 1980, Babai asked which groups admit an ORR. I will discuss this problem, and present joint work with Pablo Spiga in which we showed that every non-solvable group admits an ORR.
Other Information:
Location: B660 University Hall
Web page: http://www.cs.uleth.ca/~nathanng/ntcoseminar/
Contact:
Barb Hodgson | hodgsonb@uleth.ca | (403) 329-2470 | uleth.ca/artsci/math-computer-science
