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arXiv 2501.09447math.RTmath.CO
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奥斯特兰德正则代数与考克斯特矩阵

Auslander regular algebras and Coxeter matrices

Mathematical Institute of the University of Bonn(波恩大学数学研究所)

Viktória Klász, Rene Marczinzik, Hugh Thomas

AI总结:

研究奥斯特兰德正则代数与考克斯特矩阵,证明其等级双射与考克斯特矩阵布劳威尔分解中的置换矩阵\(P\)一致,给出新解释与快速计算方法,并应用于考克斯特矩阵行列式、分配格特征及半单李代数范畴\(\mathcal{O}\)的块中模的同调结果。

摘要:

我们证明了对于奥斯特兰德 - 戈伦斯坦代数,伊谷山的等级双射与奥斯特兰德 - 赖滕引入的双射一致。此结果使用了奥斯特兰德 - 戈伦斯坦代数的新特征描述。此外,我们表明奥斯特兰德正则代数的等级双射与考克斯特矩阵的布劳威尔分解中的置换矩阵\(P\)一致。这为等级双射提供了一种新的、纯线性代数的解释,并使我们能够以比以前更快的方式计算它。我们给出了主要结果的几个应用。首先,我们表明奥斯特兰德正则代数的考克斯特矩阵的行列式要么是\(1\)要么是\(-1\)。其次,我们在有限格类中获得了分配格的新组合特征描述。具体而言,一个格是分配格当且仅当它的考克斯特矩阵可以写成\(PU\),其中\(P\)是置换矩阵且\(U\)是上三角矩阵。其他应用包括关于半单李代数范畴\(\mathcal{O}\)的块中的模的新同调结果。

英文摘要:

We show that Iyama's grade bijection for Auslander-Gorenstein algebras coincides with the bijection introduced by Auslander-Reiten. This result uses a new characterisation of Auslander-Gorenstein algebras. Furthermore, we show that the grade bijection of an Auslander regular algebra coincides with the permutation matrix P in the Bruhat factorisation of the Coxeter matrix. This gives a new, purely linear algebraic interpretation of the grade bijection and allows us to calculate it in a much quicker way than was previously known. We give several applications of our main results. First, we show that the permanent of the Coxeter matrix of an Auslander regular algebra is either 1 or -1. Second, we obtain a new combinatorial characterisation of distributive lattices among the class of finite lattices. Explicitly, a lattice is distributive if and only if its Coxeter matrix can be written as PU where P is a permutation matrix and U is an upper triangular matrix. Other applications include new homological results about modules in blocks of category $\mathcal{O}$ of semisimple Lie algebras.

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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