On intersection indices of subvarieties in reductive groups

Details On intersection indices of subvarieties in reductive groups On intersection indices of subvarieties in reductive groups

2006-05-27

arxiv.org/abs/math/0605695v1

Moscow Mathematical Journal, 7 no.3 (2007), 489-505

Mathematics

Algebraic Geometry

15 pages, 1 figure

Scientific paper

I will present an explicit formula for the intersection indices of the Chern classes of an arbitrary reductive group with hypersurfaces. This formula has the following applications. First, it allows to compute explicitly the Euler characteristic of complete intersections in reductive groups. Second, for any regular compactification of a reductive group, it computes the intersection indices of the Chern classes of the compactification with hypersurfaces. The formula is similar to the Brion--Kazarnovskii formula for the intersection indices of hypersurfaces in reductive groups. The proof uses an algorithm of De Concini and Procesi for computing such intersection indices. In particular, it is shown that this algorithm produces the Brion--Kazarnovskii formula.

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