SEMINAR: Groups and Combinatorics Seminar: Symmetric graphs of diameter 2 arising from the classical groups Tue, 22 Jun 2010 12:00 - Maths Lecture Room 2 Carmen Amarra Groups and Combinatorics Seminar Carmen Amarra (UWA) will speak on Symmetric graphs of diameter 2 arising from the classical groups at 12noon Tuesday 22nd June in MLR2 Abstract: Let V be a vector space of dimension d over a field of q elements, and let H be an irreducible subgroup of GL(V). Let S be an H-orbit consisting of nonzero vectors, satisfying -S = S, and let Gamma= Cay(V,S). Then Gamma is G-symmetric, where G = V times H. Our goal is to find the graphs Cay(V,S) which have diameter 2, that is, those for which V is contained in S+S. In particular, we shall consider the case where H is a classical group. All welcome. For more information: Michael Giudici giudici@maths.uwa.edu.au Starts : Tue, 22 Jun 2010 12:00 Ends : Tue, 22 Jun 2010 12:45 Last Updated : Thu, 17 Jun 2010 13:34