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arXiv 1902.09176math.RTmath.RA
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阿贝尔范畴的扩张维数

The Extension Dimension of Abelian Categories

Junling Zheng, Xin Ma, Zhaoyong Huang

摘要:

设$\A$是一个阿贝尔范畴,它具有足够的投射对象和足够的内射对象.证明了如果$\A$中存在一个可加生成对象,则$\A$的扩张维数与弱归结维数相同,且至多为$\A$的表示维数减2.利用它,对于右Morita环$\La$,我们建立了右生成右$Λ$ -模范畴$\mod \La$的扩张维数与$Λ$的表示维数和右整体维数之间的关系.特别地,我们利用某类单右$Λ$ -模的投射维数和$Λ$的根层长给出了$\mod Λ$的扩张维数的一个上界.此外,我们还研究了扩张维数在某些环扩张和环元下的行为。

英文摘要:

Let $\A$ be an abelian category having enough projective objects and enough injective objects. We prove that if $\A$ admits an additive generating object, then the extension dimension and the weak resolution dimension of $\A$ are identical, and they are at most the representation dimension of $\A$ minus two. By using it, for a right Morita ring $\La$, we establish the relation between the extension dimension of the category $\mod \La$ of finitely generated right $Λ$-modules and the representation dimension as well as the right global dimension of $Λ$. In particular, we give an upper bound for the extension dimension of $\mod Λ$ in terms of the projective dimension of certain class of simple right $Λ$-modules and the radical layer length of $Λ$. In addition, we investigate the behavior of the extension dimension under some ring extensions and recollements.

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