Characterization of some projective subschemes by locally free resolutions

Details Characterization of some projective subschemes by locally free resolutions Characterization of some projective subschemes by locally free resolutions

2002-12-16

arxiv.org/abs/math/0212217v1

Mathematics

Commutative Algebra

Contemp. Math. (to appear)

Scientific paper

A locally free resolution of a subscheme is by definition an exact sequence consisting of locally free sheaves (except the ideal sheaf) which has uniqueness properties like a free resolution. The purpose of this paper is to characterize certain locally Cohen-Macaulay subschemes by means of locally free resolutions. First we achieve this for arithmetically Buchsbaum subschemes. This leads to the notion of an $\Omega$-resolution and extends a result of Chang. Second we characterize quasi-Buchsbaum subschemes by means of weak $\Omega$-resolutions. Finally, we describe the weak $\Omega$-resolutions which belong to arithmetically Buchsbaum surfaces of codimension two. Various applications of our results are given.

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