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arXiv 1003.4108math.RA
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不可约作用与可压缩模

Irreducible actions and compressible modules

Inês Borges, Christian Lomp

摘要:

代数$A$上的线性算子的任何有限集产生算子代数$B$和A上的模结构,其自同态环同构于$A$的某些不变元素的子环$A^B$。我们证明了如果$A$是一个临界可压缩左$B$ -模,那么它在$A^B$的分式环上的自内射壳$A$的维数是由$A$的一致维数和生成$B$的线性算子的个数所限定的.这扩展了一个已知的结果不可约的Hopf行动,特别适用于弱Hopf行动。进一步证明了代数A在群作用、群分次和Lie作用下临界可压缩的充要条件。

英文摘要:

Any finite set of linear operators on an algebra $A$ yields an operator algebra $B$ and a module structure on A, whose endomorphism ring is isomorphic to a subring $A^B$ of certain invariant elements of $A$. We show that if $A$ is a critically compressible left $B$-module, then the dimension of its self-injective hull $A$ over the ring of fractions of $A^B$ is bounded by the uniform dimension of $A$ and the number of linear operators generating $B$. This extends a known result on irreducible Hopf actions and applies in particular to weak Hopf action. Furthermore we prove necessary and sufficient conditions for an algebra A to be critically compressible in the case of group actions, group gradings and Lie actions.

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。

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