English

Star Configurations are Set-Theoretic Complete Intersections

Algebraic Geometry 2016-01-27 v3 Commutative Algebra

Abstract

Let APk1\mathcal A\subset\mathbb P^{k-1} be a rank kk arrangement of nn hyperplanes, with the property that any kk of the defining linear forms are linearly independent (i.e., A\mathcal A is called kk-generic). We show that for any j=0,,k2j=0,\ldots,k-2, the subspace arrangement with defining ideal generated by the (nj)(n-j)-fold products of the defining linear forms of A\mathcal A is a set-theoretic complete intersection, which is equivalent to saying that star configurations have this property.

Keywords

Cite

@article{arxiv.1507.05667,
  title  = {Star Configurations are Set-Theoretic Complete Intersections},
  author = {Stefan Tohaneanu},
  journal= {arXiv preprint arXiv:1507.05667},
  year   = {2016}
}

Comments

5 pages. In this version we present an update with an example answering negatively the question asked previously whether or not, for ANY hyperplane arrangement, all the ideals generated by a-fold products of the defining linear forms are set-theoretic complete intersections

R2 v1 2026-06-22T10:15:22.103Z