arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0311420math.RA
收藏

用于某些扩展的中心闭合结构。霍普夫代数作用的应用

A central closure construction for certain extensions. Applications to Hopf algebra actions

Christian Lomp

摘要:

代数扩张A < B,其中A是左B-模,使得B-作用扩张A中的乘法是普遍存在的。我们遇到的例子,这种扩展的研究群作用,组分级或更一般的霍普夫行动,以及在研究的双模结构的代数。本文将R.Wisbauer利用半素代数的乘法代数构造半素代数的中心闭包的方法推广到这类代数的扩张上。更精确地说,如果A是一个k-代数,B是End(A)的一个包含A的乘法代数的子代数,则A作为B-模的自内射壳\hat{A}成为一个k-代数,只要A不包含任何幂零B-稳定理想.我们证明了在一定的假设下,\hat{A}可以与A的Martindale商环的一个子代数相同.然后将这种构造应用于Hopf模代数。

英文摘要:

Algebra extensions A < B where A is a left B-module such that the B-action extends the multiplication in A are ubiquitous. We encounter examples of such extensions in the study of group actions, group gradings or more general Hopf actions as well as in the study of the bimodule structure of an algebra. In this paper we are extending R.Wisbauer's method of constructing the central closure of a semiprime algebra using its multiplication algebra to those kinds of algebra extensions. More precisely if A is a k-algebra and B some subalgebra of End(A) that contains the multiplication algebra of A, then the self-injective hull \hat{A} of A as B-module becomes an k-algebra provided A does not contain any nilpotent B-stable ideals. We show that under certain assumptions \hat{A} can be identified with a subalgebra of the Martindale quotient ring of A. This construction is then applied to Hopf module algebras.

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。

↑