3:00 p.m., Friday (November 18, 2005)
MATH ANNEX 1100
University of Alberta
Essential dimensions of algebraic groups
Given an algebraic group G over a field K one can associate
to it the set of isomorphism classes of G-torsors. The essential
dimension ed(G) of G is a discrete invariant which measures how
complicated G-torsors are. In general it is difficult to compute
ed(G). In the talk we give a survey of results related to computation
of essential dimensions through orthogonal representations.
Refreshments will be served at 2:45 p.m. (MATX 1115, Math Faculty Lounge).