arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1211.3192math.AC
收藏

广义重数序列的一个线性公式

A linear formula for the generalized multiplicity sequence

Thomas Dunn

摘要:

对于局部环R中的任意理想I和R-生成R-模M,我们证明了一个将每个广义重数序列c_k(I,M)表示为某些局部重数的线性组合的公式.因此,当M是形式等维的时,我们证明了:如果I包含在J中,且对所有k,c_k(I,M)=c_k(J,M),则I是(J,M)的约化.这一说法的逆也被称为是真实的一个结果Ciuelia。该定理给出了整闭包的一个完整的数值刻画,推广了Rees的一个著名定理.

英文摘要:

For an arbitrary ideal I in a local ring R and a finitely generated R-module M, we prove a formula expressing each generalized multiplicity sequence c_k(I,M) as a linear combination of certain local multiplicities. As a consequence, when M is formally equidimensional, we prove that if I is contained in J and c_k(I,M)=c_k(J,M) for all k, then I is a reduction of (J,M). The converse of this statement is also known to be true by a result of Ciuperca. This theorem gives a complete numerical characterization of the integral closure, generalizing a well known theorem of Rees.

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。

↑