# Calendar

Algebra Seminar

## 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).

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