中文

与其pro-$p$完备化具有相同上同调的群

群论 2010-09-16 v3 K理论与同调

摘要

对任意素数pp和群GG,记GG的pro-pp完备化为G^p\hat{G}^p。设C\mathcal{C}是所有满足如下条件的群GG的类:对每个自然数nn和素数ppHn(Gp^,Z/p)Hn(G,Z/p)H^n(\hat{G^p},\mathbb Z/p)\cong H^n(G, \mathbb Z/p),其中Z/p\mathbb Z/p被视为离散的平凡G^p\hat{G}^p-模。本文我们识别了C\mathcal{C}中的某些类型的群。特别地,我们证明了右角Artin群属于C\mathcal{C},并且该类也包含某些特殊类型的带合并的自由积。

关键词

引用

@article{arxiv.0809.3046,
  title  = {Groups with the same cohomology as their pro-$p$ completions},
  author = {Karl Lorensen},
  journal= {arXiv preprint arXiv:0809.3046},
  year   = {2010}
}

备注

The revisions in the second version pertain to the exposition: the proof of Prop. 1.1, in particular, now includes more details. The third version includes a proof that right-angled Artin groups are residually $p$-finite for every prime $p$