arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.08955math.AT
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链复形的模型结构

The model structure for chain complexes

Neil Strickland

摘要:

设$\text{Ch}$是阿贝尔群的(可能无界的)链复形的范畴。在本文中,我们构造了$\text{Ch}$上的标准Quillen模型结构,其方法与标准方法略有不同。本质上,我们对阿贝尔群使用函子两阶段投射分解,并直接从中构建所有内容。这具有非常具体、明确和功能性的优点。它不依赖于小对象论证,也不明确使用超穷归纳法。另一方面,它不是那么概念性的,它确实使用了自由阿尔贝群的子群是自由的这一事实,所以它并没有推广到$\mathbb{Z}$以外的许多环。我们并不认为这种方法有任何巨大的技术优势,但它似乎是一种有趣的替代方案,并且可能在教学上有用。

英文摘要:

Let $\text{Ch}$ be the category of (possibly unbounded) chain complexes of abelian groups. In this note we construct the standard Quillen model structure on $\text{Ch}$, by a method that is somewhat different from the standard one. Essentially, we use a functorial two-stage projective resolution for abelian groups, and build everything directly from that. This has the advantage of being very concrete, explicit and functorial. It does not rely on the small object argument, or make any explicit use of transfinite induction. On the other hand, it is not so conceptual, and it does use the fact that subgroups of free abelian groups are free, so it does not generalise to many rings other than $\mathbb{Z}$. We do not claim any great technical benefit for this approach, but it seems like an interesting alternative, and may be pedagogically useful.

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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