Woensdag 15 januari 2003
Spreker: 
Franziska Bittner (UU)

Titel: 
Euler characteristics of varieties and mappings

Tijd: 
11:00  12:00

Plaats: 
CK N4 (N3045)

Vanaf half 11 is er koffie en chocola.
Abstract
We call an invariant $e$ of algebraic varieties (solutions of
polynomial equations) with the property that $e(X)=e(Y)+e(XY)$ for
$Y\subset X$ a closed subvariety ($Y$ is given by more equations than $X$)
an
Euler characteristic with compact support.
There is a simple description of the
universal Euler characteristic
with compact support in the case of a ground field (the field where the
coefficients of the equations are from) of characteristic zero.
I would like to mention some applications and generalizations.