If X is a finite set of points in a multiprojective space P^n_1 X... X P^n_r with r >= 2, then X may or may not be arithmetically Cohen-Macaulay (ACM). For sets of points in P^1 X P^1 there are several classifications of the ACM sets of points. In this paper we investigate the natural generalizations of these classifications to an arbitrary multiprojective space. We show that each classification for ACM points in P^1 X P^1 fails to extend to the general case. We also give some new necessary and sufficient conditions for a set of points to be ACM.
|Titolo:||ACM sets of points in Multiprojective Spaces|
|Data di pubblicazione:||2008|
|Appare nelle tipologie:||1.1 Articolo in rivista|