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arXiv 0903.0758math.RTmath.RA
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极大$n$ -正交子范畴的存在性

The Existence of Maximal $n$-Orthogonal Subcategories

Zhaoyong Huang, Xiaojin Zhang

摘要:

对于具有整体维度$n$的$(n-1)$ -Auslander代数$Λ$,我们根据具有投射维度$n-1$或$n$的简单$Λ$ -模的性质,给出了$Λ$允许极大$(n-1)$ -正交子范畴的一些必要条件。对整体维数为2的几乎遗传代数$Λ$,证明了$Λ$存在极大1-正交子范畴当且仅当对任意非投射不可分解$Λ$ -模$M$,$M$是内射的等价于$M$的约化阶等于2.给出了Gorenstein对称猜想与共倾模$T$的$^{\bot}T$的极大$n$ -正交子范畴的存在性之间的联系.对Gorenstein代数,证明了极大$n$ -正交模的所有非投射直和都是$Ω^nτ$ -周期的.此外,我们还研究了模的复杂性与两个有限维代数的张量积的极大$n$ -正交子范畴的存在性之间的关系。

英文摘要:

For an $(n-1)$-Auslander algebra $Λ$ with global dimension $n$, we give some necessary conditions for $Λ$ admitting a maximal $(n-1)$-orthogonal subcategory in terms of the properties of simple $Λ$-modules with projective dimension $n-1$ or $n$. For an almost hereditary algebra $Λ$ with global dimension 2, we prove that $Λ$ admits a maximal 1-orthogonal subcategory if and only if for any non-projective indecomposable $Λ$-module $M$, $M$ is injective is equivalent to that the reduced grade of $M$ is equal to 2. We give a connection between the Gorenstein Symmetric Conjecture and the existence of maximal $n$-orthogonal subcategories of $^{\bot}T$ for a cotilting module $T$. For a Gorenstein algebra, we prove that all non-projective direct summands of a maximal $n$-orthogonal module are $Ω^nτ$-periodic. In addition, we study the relation between the complexity of modules and the existence of maximal $n$-orthogonal subcategories for the tensor product of two finite-dimensional algebras.

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