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arXiv 2201.02224math.CTmath.RA
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Grothendieck范畴中有限型对象的挠类和无挠的类

Torsion and torsion-free classes from objects of finite type in Grothendieck categories

Daniel Bravo, Sinem Odabaşı, Carlos E. Parra, Marco A. Pérez

摘要:

在任意的Grothendieck范畴中,我们找到了$\text{FP}_n$ -内射对象类是挠类的充要条件.通过这样做,我们提出了$n$ -遗传范畴的概念。定义并研究了具有小投射对象生成集的Grothendieck范畴中的$\text{FP}_n$ -平坦对象类,给出了该类是无挠的的几个等价条件.最后给出了$n$ -遗传范畴在环上模、模的链复形和从加法范畴到阿贝尔群范畴的范畴中的应用和例子。关于后者的设置,我们发现一个特征时,这些函子范畴是$n$ -遗传的域添加剂范畴。

英文摘要:

In an arbitrary Grothendieck category, we find necessary and sufficient conditions for the class of $\text{FP}_n$-injective objects to be a torsion class. By doing so, we propose a notion of $n$-hereditary categories. We also define and study the class of $\text{FP}_n$-flat objects in Grothendieck categories with a generating set of small projective objects, and provide several equivalent conditions for this class to be torsion-free. In the end, we present several applications and examples of $n$-hereditary categories in the contexts modules over a ring, chain complexes of modules and categories of additive functors from an additive category to the category of abelian groups. Concerning the latter setting, we find a characterization of when these functor categories are $n$-hereditary in terms of the domain additive category.

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