1. Containment Problem for Quasi Star Configurations of Points in ℙ2
- Author
-
Mohammad Mosakhani and Hassan Haghighi
- Subjects
Containment (computer programming) ,Algebra and Number Theory ,Ideal (set theory) ,Mathematics::Commutative Algebra ,Applied Mathematics ,010102 general mathematics ,Type (model theory) ,Topology ,01 natural sciences ,Quasi-star ,0103 physical sciences ,010307 mathematical physics ,0101 mathematics ,Mathematics - Abstract
In this paper, the containment problem for the defining ideal of a special type of zero-dimensional subscheme of ℙ2, the so-called quasi star configuration, is investigated. Some sharp bounds for the resurgence of these types of ideals are given. As an application of this result, for every real number [Formula: see text], we construct an infinite family of homogeneous radical ideals of points in 𝕂[ℙ2] such that their resurgences lie in the interval [2−ε, 2). Moreover, the Castelnuovo-Mumford regularity of all ordinary powers of defining ideal of quasi star configurations are determined. In particular, it is shown that all of these ordinary powers have a linear resolution.
- Published
- 2018