The affine class group of a normal scheme

Details The affine class group of a normal scheme The affine class group of a normal scheme

2002-09-23

arxiv.org/abs/math/0209298v1

Communications in Algebra 31, 6 (2003), 2849-2867

Mathematics

Commutative Algebra

to appear in Communications in Algebra

Scientific paper

We study the property of a normal scheme, that the complement of every hypersurface is an affine scheme. To this end we introduce the affine class group. It is a factor group of the divisor class group and measures the deviation from this property. We study the behaviour of the affine class group under faithfully flat extensions and under the formation of products, and we compute it for different classes of rings.

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