Containments of symbolic powers of ideals of generic points in $\PP^3$

TL;DR

This paper proves a conjecture related to symbolic powers of ideals of generic points in projective 3-space, establishing containment relations and bounds that generalize known inequalities, and provides new lower bounds for the Waldshmidt constant.

Contribution

It confirms the Harbourne-Huneke conjecture for ideals of generic points in ^3 and derives generalized bounds and Waldshmidt constant estimates.

Findings

Proves the Harbourne-Huneke conjecture for generic points in ^3.

Establishes generalized bounds similar to Chudnovsky inequalities.

Provides lower bounds for the Waldshmidt constant of such ideals.

Abstract

We show that the Conjecture of Harbourne and Huneke, $I^{(Nr-(N-1))} \subset M^{(r-1)(N-1)}I^{r}$ holds for ideals of generic (simple) points in $\PP^3$. As a result, for such ideals we prove the following bounds, which can be recognized as generalizations of Chudnovsky bounds: $\alpha(I^{(3m-k)}) \geq m\alpha(I)+2m-k$, for any $m \geq 1$ and $k=0,1,2$. Moreover, we obtain lower bounds for the Waldshmidt constant for such ideals.