Intersection multiplicities over Gorenstein rings

Details Intersection multiplicities over Gorenstein rings Intersection multiplicities over Gorenstein rings

2002-10-08

arxiv.org/abs/math/0210129v1

Mathematische Annalen, 317 (2000) 155-171

Mathematics

Commutative Algebra

Scientific paper

We construct a complex of free-modules over a Gorenstein ring R of dimension five, for which the Euler characteristic and Dutta multiplicity are different. This complex is the resolution of an R-module of finite length and finite projective dimension. As a consequence, the ring R has a nonzero Todd class tau_3(R) and a bounded free complex whose local Chern character does not vanish on this class. In the course of our work, we construct a module N of finite length and finite projective dimension over the hypersurface A=K[u,v,w,x,y,z]/(ux+vy+wz), such that the Serre intersection multiplicity of the modules N and A/(u,v,w)A is -2.

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