arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv math/0312302math.ACmath.RA
收藏

关于乘法不变量的Cohen-Macaulay性质

On the Cohen-Macaulay property of multiplicative invariants

Martin Lorenz

摘要:

研究有限群$G$的乘法作用下不变环的Cohen-Macaulay性质.根据定义,这些是洛朗多项式代数上的$G$ -作用,它稳定了由变量中的所有单项式组成的乘法群。在大多数情况下,我们集中讨论基环是有理数整数环的情况。我们的主要结果表明,如果$G$作用非平凡,不变代数为Cohen-Macaulay,则所有单项式m的阿贝尔化各向同性群$G_m/[G_m,G_m]$由双反射生成,且至少有一个$G_m/[G_m,G_m]$是非平凡的.作为应用,我们证明了Kemper的3-copies猜想的乘法版本。

英文摘要:

We investigate the Cohen-Macaulay property for rings of invariants under multiplicative actions of a finite group $G$. By definition, these are $G$-actions on Laurent polynomial algebras that stabilize the multiplicative group consisting of all monomials in the variables. For the most part, we concentrate on the case where the base ring is the ring of rational integers. Our main result states that if $G$ acts non-trivially and the invariant algebra is Cohen-Macaulay then the abelianized isotropy groups $G_m/[G_m,G_m]$ of all monomials m are generated by bireflections and at least one $G_m/[G_m,G_m]$ is non-trivial. As an application, we prove the multiplicative version of Kemper's 3-copies conjecture.

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。

↑