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arXiv 1001.5397math.AC
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Herzog-Northcott型理想

Ideals of Herzog-Northcott type

Liam O'Carroll, Francesc Planas-Vilanova

摘要:

本文重新研究了2 × 3矩阵的2 × 2子式所生成的理想,其元素是3个元素的幂,不一定形成正则序列。一个特殊的情况下,这是理想确定单项式曲线在三维空间,这已经研究了赫尔佐格。在这里研究的更广泛的背景下,这些理想被确定为Vasconcelos意义下的Northcott理想,因此它们的联络性质被显示出来。它表明,它们是集理论上完整的交叉口,重温工作的Bresinsky和Valla。即使当这三个元素是采取的变量在一个多项式环的三个变量在一个领域,这一点的观点给出了一个更大的类的理想不仅仅是定义理想的单式曲线。然后,我们的特点时,在这个较大的类的理想是总理,我们表明,他们通常是激进的,并利用理论的多重性,我们给他们的最小素理想的数量上界,这些素数之一是一个唯一确定的素理想的定义的单项曲线。最后,我们提供了这些理想的依赖于特征的最小素结构和准素结构的例子。

英文摘要:

This paper takes a new look at ideals generated by 2x2 minors of 2x3 matrices whose entries are powers of three elements not necessarily forming a regular sequence. A special case of this are the ideals determining monomial curves in three dimensional space, which were already studied by Herzog. In the broader context studied here, these ideals are identified as Northcott ideals in the sense of Vasconcelos, and so their liaison properties are displayed. It is shown that they are set-theoretically complete intersections, revisiting the work of Bresinsky and of Valla. Even when the three elements are taken to be variables in a polynomial ring in three variables over a field, this point of view gives a larger class of ideals than just the defining ideals of monomial curves. We then characterize when the ideals in this larger class are prime, we show that they are usually radical and, using the theory of multiplicities, we give upper bounds on the number of their minimal prime ideals, one of these primes being a uniquely determined prime ideal of definition of a monomial curve. Finally, we provide examples of characteristic-dependent minimal prime and primary structures for these ideals.

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