The Witt group of surfaces and 3-folds
Charles Weibel: Rutgers University
Location: Hill 705
Date & time: Wednesday, 01 March 2017 at 2:00PM - 2:11PM
If V is an algebraic variety, the Witt group is formed from vector bundles equipped with a nondegenerate symmetric bilinear form. When it has dimension \[<4\], it embeds into the more classical Witt group of the function field (Witt 1934). When V is defined over the reals, versions of the discriminant and Hasse invariant enable us to determine W(V).