arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.12350math.AT
收藏

模2位形空间的等变上同调

Equivariant Cohomology of Configuration Spaces mod 2: The State of the Art

Pavle V. M. Blagojević, Frederick R. Cohen, Michael C. Crabb, Wolfgang Lück, Günter M. Ziegler

摘要:

经典位形空间$F(\mathbb{R}^d,n)$的等变上同调一直是人们非常感兴趣的,并且从Artin(1925/1947)关于辫子理论的经典论文开始,Fox和Neujerth(1962),Fadell和Neujerth(1962),以及Arnol'd(1969)都对它进行了深入的研究。我们对这个问题从开始到最近的发展作一个简短的处理。然而,我们专注于经典配置空间$F(\mathbb{R}^d,n)$的模2等变上同调代数,如Hung(1990)的一篇有影响力的论文中所描述的。我们显示了一个新的,详细的证明,他的主要结果是正确的,但参数,所给予的洪途中,他的结果不是,因为是一些中间结果在他的文件。这使得本文的三位作者Blagojević、Lück \& Ziegler(2016)的一篇论文失效,他们使用Hung(1990)的一个中间结果来推导$k$ -正则嵌入和$\ell$ -斜嵌入存在的下界。利用我们对Hung主要结果的新证明,我们得到了高正则嵌入存在性的新的下界:有些与以前的界一致,有些更弱。

英文摘要:

The equivariant cohomology of the classical configuration space $F(\mathbb{R}^d,n)$ has been been of great interest and has been studied intensively starting with the classical papers by Artin (1925/1947) on the theory of braids, by Fox and Neuwirth (1962), Fadell and Neuwirth (1962), and Arnol'd (1969). We give a brief treatment of the subject from the beginnings to recent developments. However, we focus on the mod 2 equivariant cohomology algebras of the classical configuration space $F(\mathbb{R}^d,n)$, as described in an influential paper by Hung (1990). We show with a new, detailed proof that his main result is correct, but that the arguments that were given by Hung on the way to his result are not, as are some of the intermediate results in his paper. This invalidates a paper by three of the present authors, Blagojević, Lück \& Ziegler (2016), who used a claimed intermediate result from Hung (1990) in order to derive lower bounds for the existence of $k$-regular and $\ell$-skew embeddings. Using our new proof for Hung's main result, we get new lower bounds for existence of highly regular embeddings: Some of them agree with the previously claimed bounds, some are weaker.

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。

↑