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arXiv 1002.3926math.CT
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三角范畴的Auslander-Buchweitz逼近论

Auslander-Buchweitz approximation theory for triangulated categories

O. Mendoza, E. C. Saenz, V. Santiago, M. J. Souto Salorio

摘要:

我们引入并发展了一个类似的Auslander-Buchweitz逼近论(见\cite{AB})在三角范畴的背景下,通过使用一个版本的相对同源性在这种设置。我们还证明了三角化范畴$\T,$中的相对同调代数的几个结果,这些结果是基于某些子范畴在有限分解和Hom-space消失下的行为。举例来说:我们建立了$\T.$的某些三角化子范畴中的preenvelope(和precover)的存在性。结果类似于Auslander和Buchweitz的各种构造和结果,并且集中于探索配备有一对$(\X,ω),$的三角化范畴$\T$的结构,其中$\X$在扩张下是封闭的,而$ω$通常在附加条件下是$\X,$中的弱共生成元。这减少,除其他事项外,存在杰出的三角形享有特殊性质,和行为(适当定义)(共同)决议,射影或内射维度的对象的$\T$和形成正交子类别。最后,讨论了三角范畴中Rouquier维数的一些关系.

英文摘要:

We introduce and develop an analogous of the Auslander-Buchweitz approximation theory (see \cite{AB}) in the context of triangulated categories, by using a version of relative homology in this setting. We also prove several results concerning relative homological algebra in a triangulated category $\T,$ which are based on the behavior of certain subcategories under finiteness of resolutions and vanishing of Hom-spaces. For example: we establish the existence of preenvelopes (and precovers) in certain triangulated subcategories of $\T.$ The results resemble various constructions and results of Auslander and Buchweitz, and are concentrated in exploring the structure of a triangulated category $\T$ equipped with a pair $(\X,ω),$ where $\X$ is closed under extensions and $ω$ is a weak-cogenerator in $\X,$ usually under additional conditions. This reduces, among other things, to the existence of distinguished triangles enjoying special properties, and the behavior of (suitably defined) (co)resolutions, projective or injective dimension of objects of $\T$ and the formation of orthogonal subcategories. Finally, some relationships with the Rouquier's dimension in triangulated categories is discussed.

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