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arXiv 2103.01364math.CTmath.RA
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阿贝尔范畴中的次投射性

Subprojectivity in abelian categories

Houda Amzil, Driss Bennis, J. R. Garcia Rozas, Hanane Ouberka, Luis Oyonarte

摘要:

在过去的几年里,Lopez-Permouth和几个合作者在模的经典投射性、内射性和平坦性的研究中引入了一种新的方法。通过这种方式,他们引入了模的次投射域作为一种工具,以某种方式测量这样一个模的投射水平(因此不仅仅是确定模是否是投射的)。本文对任意阿贝尔范畴中的次投射性提出了一种新的处理方法,从而使它的一些重要方面更加清楚。即利用次投射性统一了一些经典环的结果,刻画了一些经典环。它还表明,在某些类别中,subprojectivity措施的概念以外的投射。此外,这种新的方法允许,除了建立良好的推广已知的结果,以构建各种新的例子,如次投射域的类Gorenstein投射对象,类的半投射复合物和特定类型的表示的有限线性代数。本文最后的一项研究表明,事实上,一个subprojectivity域的一个类与其第一个右外正交类重合,其特征在于存在preenvelopes和precover。

英文摘要:

In the last few years, Lopez-Permouth and several collaborators have introduced a new approach in the study of the classical projectivity, injectivity and flatness of modules. This way, they introduced subprojectivity domains of modules as a tool to measure, somehow, the projectivity level of such a module (so not just to determine whether or not the module is projective). In this paper we develop a new treatment of the subprojectivity in any abelian category which shed more light on some of its various important aspects. Namely, in terms of subprojectivity, some classical results are unified and some classical rings are characterized. It is also shown that, in some categories, the subprojectivity measures notions other than the projectivity. Furthermore, this new approach allows, in addition to establishing nice generalizations of known results, to construct various new examples such as the subprojectivity domain of the class of Gorenstein projective objects, the class of semi-projective complexes and particular types of representations of a finite linear quiver. The paper ends with a study showing that the fact that a subprojectivity domain of a class coincides with its first right Ext-orthogonal class can be characterized in terms of the existence of preenvelopes and precovers.

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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