中文

关于带对合的 Azumaya 代数的 Gersten-Witt 复形

代数几何 2022-02-01 v2 K理论与同调 数论

摘要

(A,σ)(A,\sigma) 为正则环 RR 上的带对合的 Azumaya 代数。我们证明 Gille 定义的 (A,σ)(A,\sigma) 的 Gersten-Witt 复形同构于 Bayer-Fluckiger、Parimala 及作者所定义的 (A,σ)(A,\sigma) 的 Gersten-Witt 复形。我们结合两种构造的优点,证明当 dimR3\dim R\leq 3indA2\mathrm{ind}\, A\leq 2σ\sigma 为正交或辛对合时,Gersten-Witt 复形正合。这意味着在上述相同假设下,Grothendieck-Serre 猜想对 AAσ\sigma-酉元素群 RR-概形成立;RR 不要求包含一个域。

关键词

引用

@article{arxiv.2102.06264,
  title  = {On The Gersten-Witt Complex of an Azumaya Algebra with Involution},
  author = {Uriya A. First},
  journal= {arXiv preprint arXiv:2102.06264},
  year   = {2022}
}

备注

26 pages. Changes from previous version: Section 7 rewritten, added section 2C, some typos fixed. The source files include an extra pdf with details of suppressed straightforward computations. [An earlier version used to be the appendix of arXiv:1911.07666v1 (which was removed in arXiv:1911.07666v2).]