中文

关于剩余 poly-$\mathbb Z$ 群的顶维 $L^2$-Betti 数

群论 2026-01-27 v1

摘要

GG 为有限型的剩余 poly-Z\mathbb Z 群。我们证明 GG 允许一个核 NN 满足 cdQ(N)<cdQ(G)\mathrm{cd}_{\mathbb Q}(N) < \mathbb{cd}_{\mathbb Q}(G) 的 poly-Z\mathbb Z 商群,当且仅当 GG 的顶维 L2L^2-Betti 数消失。

关键词

引用

@article{arxiv.2601.18594,
  title  = {On the top-dimensional $L^2$-Betti number of residually poly-$\mathbb Z$ groups},
  author = {Sam P. Fisher and Pablo Sánchez-Peralta},
  journal= {arXiv preprint arXiv:2601.18594},
  year   = {2026}
}

备注

9 pages. Intended for publication in the "Geometry and Topology of Polyhedral Complexes" conference proceedings