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arXiv 0911.0633math.RT
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Auslander-Reiten序列在子范畴中的存在性

Existence of Auslander-Reiten sequences in subcategories

Puiman Ng

摘要:

本文研究了模A的子范畴中Auslander-Reiten序列的存在性,其中A是域上的有限维代数.这两个定理给出了子范畴中Auslander-Reiten序列存在的充要条件。设M是模A在扩张和直和项下闭的子范畴,X是M中的不可分解模,使得对M中的某个X',Ext^{1}(X,X')不为零.(ii)M中存在Auslander-Reiten序列0 -> U -> W -> X -> 0.我们也得到了上述定理的对偶结果。

英文摘要:

This paper studies the existence of Auslander-Reiten sequences in subcategories of mod A, where A is a finite dimensional algebra over a field. The two main theorems give necessary and sufficient conditions for the existence of Auslander-Reiten sequences in subcategories. Let M be a subcategory of mod A closed under extensions and direct summands, and let X be an indecomposable module in M such that Ext^{1}(X, X') is not zero for some X' in M. Then the following are equivalent: (i) DTrX has a precover in the stable category of mod A, (ii) There exists an Auslander-Reiten sequence 0 --> U --> W --> X --> 0 in M. We also have the dual result of the above theorem.

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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