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arXiv 2510.09501math.RA
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关于幂等矩阵的一个注记:偏序结构与构造

A Note on Idempotent Matrices: The Poset Structure and The Construction

Sen-Peng Eu, Yong-Siang Lin, Wei-Liang Sun

AI总结:

本文从偏序结构与构造两方面研究除环及主理想整环上的幂等矩阵,利用块分解刻画偏序,借助Smith标准形给出等价条件,并推广至唯一分解整环及Kronecker积等构造。

摘要:

幂等元在环论中扮演着基础性角色,因为它们编码了底层代数结构的重要信息。本文从两个视角研究幂等矩阵。首先,我们分析除环上矩阵环中幂等元的偏序集。我们利用幂等矩阵的块分解显式刻画了偏序关系。其次,在主理想整环上,我们利用Smith标准形从矩阵分解出发建立了矩阵为幂等矩阵的等价条件。我们还考虑了唯一分解整环上的推广以及通过Kronecker积和反对称转置的构造。这些结果共同阐明了矩阵环中幂等元的结构与构造两方面。此外,域上幂等矩阵的集合可视为一个仿射代数簇。

英文摘要:

Idempotent elements play a fundamental role in ring theory, as they encode significant information about the underlying algebraic structure. In this paper, we study idempotent matrices from two perspectives. First, we analyze the partially ordered set of idempotents in matrix rings over a division ring. We characterize the partial order relation explicitly in terms of block decompositions of idempotent matrices. Second, over principal ideal domains, we establish an equivalent condition for a matrix to be idempotent, derived from matrix factorizations using the Smith normal form. We also consider extensions over unique factorization domains and constructions via the Kronecker product and the anti-transpose. Together, these results clarify both the structural and constructive aspects of idempotents in matrix rings. Moreover, the set of idempotent matrices over a field can be viewed as an affine algebraic variety.

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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