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arXiv 2303.04232math.OA
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有限群在素C*-代数上的真外作用与严格外作用

Properly Outer and Strictly Outer Actions of Finite Groups on Prime C*-algebras

Costel Peligrad

AI总结:

本文定义有限群在素C*-代数上的严格外作用,证明其与真外作用等价,并在有限交换群情形建立其与相关作用性质的等价关系。

摘要:

紧群(尤其是有限群)在C*-代数上的作用,若群中除恒等映射外没有任何自同构能由该C*-代数的局部乘子代数中的酉元实现,则称为真外的。本文中,我定义了严格外作用的概念(类似于文献[11]中对von Neumann因子的定义),并证明对于有限群而言,它与作用的真外在性等价。对于有限交换群,这又与该作用的其他相关性质等价。

英文摘要:

An action of a compact, in particular finite group on a C*-algebra is called properly outer if no automorphism of the group that is distinct from identity is implemented by a unitary element of the algebra of local multipliers of the C*-algebra. In this paper I define the notion of strictly outer action (similar to the definition for von Neumann factors in [11]) and prove that for finite groups it is equivalent with proper outerness of the action. For finite abelian groups this is equivalent with other relevant properities of the action.

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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