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arXiv 2007.13426math.RA
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结合代数上的精细分次与自同构群

Fine gradings and automorphism groups on associative algebras

Adrián Rodrigo-Escudero

AI总结:

本文研究结合代数的精细分次与自同构群,给出了分次精细的充要条件,并计算了相关自同构群,特别在实数域上有限维单代数情形下给出具体结果。

摘要:

首先,我们证明在分次单的幺结合代数中,若其分次群是阿贝尔群,则稳定化子中的任何内自同构都是通过一个齐次元素的共轭作用实现的。现在考虑一个阿贝尔群在结合代数上的分次,使得该代数是分次单的,并且满足关于分次左理想的降链条件。我们给出了该分次是精细分次的充分必要条件。然后,我们假设这些精细分次的必要条件之一得到满足,并计算该分次的自同构群;结果以分次除环代数的自同构群的形式表达。最后,我们计算了当基域为实数域且底层代数(忽略分次)是单的且有限维时,分次除环代数的自同构群。

英文摘要:

First we prove that any inner automorphism in the stabilizer of a graded-simple unital associative algebra whose grading group is abelian is the conjugation by a homogeneous element. Now consider a grading by an abelian group on an associative algebra such that the algebra is graded-simple and satisfies the DCC on graded left ideals. We give necessary and sufficient conditions for the grading to be fine. Then we assume that one of these necessary conditions to be fine is satisfied, and we compute the automorphism groups of the grading; the results are expressed in terms of the automorphism groups of a graded-division algebra. Finally we compute the automorphism groups of graded-division algebras in the case in which the ground field is the field of real numbers, and the underlying algebra (disregarding the grading) is simple and of finite dimension.

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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