arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.04863math.AC
收藏

单项理想的控制阶

The order of dominance of a monomial ideal

Guillermo Alesandroni

摘要:

设S是域上的n元多项式环,M是S的单项理想.我们引入了一个新的不变量,称为S/M的优势阶,记为Odom(S/M),它与S/M的余维数有许多相似之处。我们使用这个支配顺序来刻画科恩-麦考利的Scarf理想类,并且还刻画泰勒分解何时最小。我们还证明了odom(S/M)具有如下性质:(i)codim(S/M)<= odom(S/M)<= pd(S/M). (ii)pd(S/M)=n当且仅当odom(S/M)=n。(iii)pd(S/M)=1当且仅当odom(S/M)=1。(iv)如果odom(S/M)=n-1,则pd(S/M)=n-1。

英文摘要:

Let S be a polynomial ring in n variables over a field, and let M be a monomial ideal of S. We introduce a new invariant, called the order of dominance of S/M, denoted odom(S/M), which has many similarities with the codimension of S/M. We use this order of dominance to characterize the class of Scarf ideals that are Cohen-Macaulay, and also to characterize when the Taylor resolution is minimal. We also show that odom(S/M) has the following properties: (i) codim(S/M) <= odom(S/M) <= pd(S/M). (ii) pd(S/M)=n if and only if odom(S/M)=n. (iii) pd(S/M)=1 if and only if odom(S/M)=1. (iv) If odom(S/M)=n-1 then pd(S/M)=n-1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑