A stable version of Harbourne's Conjecture and the containment problem for space monomial curves

Abstract

The symbolic powers $I^{(n)}$ of a radical ideal $I$ in a polynomial ring consist of the functions that vanish up to order $n$ in the variety defined by $I$. These do not necessarily coincide with the ordinary algebraic powers $I^n$, but it is natural to compare the two notions. The containment problem consists of determining the values of $n$ and $m$ for which $I^{(n)}\subseteq I^m$ holds. When $I$ is an ideal of height $2$ in a regular ring, $I^{(3)}\subseteq I^2$ may fail, but we show that this containment does hold for the defining ideal of the space monomial curve $(t^a,t^b,t^c)$. More generally, given a radical ideal $I$ of big height $h$, while the containment $I^{(hn-h+1)}\subseteq I^n$ conjectured by Harbourne does not necessarily hold for all $n$, we give sufficient conditions to guarantee such containments for $n\gg 0$.

arXiv commentv5 corrects a small typo in the published version (reflection arrangements reflection arrangements)

References in corpus (8)

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• Comparison of symbolic and ordinary powers of ideals
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Cited by in corpus (7)

• On resurgence via asymptotic resurgence
• Singular loci of reflection arrangements and the containment problem
• The Initial Degree of Symbolic Powers of Fermat-like Ideals of Planes and Lines Arrangements
• On the containment problem for fat points ideals
• On the resurgence and asymptotic resurgence of homogeneous ideals
• Symbolic Rees algebras
• On the stable Harbourne conjecture for ideals defining space monomial curves