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arXiv · 2404.09224

Quotient Modules of Finite Length and Their Relation to Fredholm Elements in Semiprime Rings

Niklas Ludwig
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Abstract

B. A. Barnes introduced so-called Fredholm elements in a semiprime ring whose definition is inspired by Atkinson's theorem. Here the socle of a semiprime ring generalizes the ideal of finite-rank operators on a Banach space. In this paper, we aim to see that the algebraic concept of the length of a module is strongly related to that of Fredholm elements. This motivates another generalization of Fredholm elements by requiring for an element $a\in\mathcal{A}$ that the $\mathcal{A}$-modules of the form $\mathcal{A}/\mathcal{A} a$ and $\mathcal{A}/a\mathcal{A}$ are of finite length. We are particularly interested in sufficient conditions for our generalized Fredholm elements to be Fredholm. In a unital C$^*$-algebra $\mathcal{A}$ we shall even see that an element $a\in\mathcal{A}$ is Fredholm if and only if the $\mathcal{A}$-modules $\mathcal{A}/\mathcal{A} a$ and $\mathcal{A}/a\mathcal{A}$ both have finite length.

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BibTeXRIS

Niklas Ludwig. 2024-04-14. Quotient Modules of Finite Length and Their Relation to Fredholm Elements in Semiprime Rings. https://arxiv.org/abs/2404.09224

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