English

The algebraic cheap rebuilding property

Group Theory 2025-10-28 v2 Algebraic Topology

Abstract

We present an axiomatic approach to combination theorems for various homological properties of groups and, more generally, of chain complexes. Examples of such properties include algebraic finiteness properties, 2\ell^2-invisibility, 2\ell^2-acyclicity, lower bounds for Novikov--Shubin invariants, and vanishing of homology growth. As a key example, we introduce an algebraic version of Ab\'ert--Bergeron--Fr\k{a}czyk--Gaboriau's cheap rebuilding property that implies vanishing of torsion homology growth and fits into our axiomatic framework for combination theorems. In particular, we obtain that certain graphs of groups with amenable vertex groups and elementary amenable edge groups have vanishing torsion homology growth.

Keywords

Cite

@article{arxiv.2409.05774,
  title  = {The algebraic cheap rebuilding property},
  author = {Kevin Li and Clara Loeh and Marco Moraschini and Roman Sauer and Matthias Uschold},
  journal= {arXiv preprint arXiv:2409.05774},
  year   = {2025}
}

Comments

44 pages, to appear in TAMS

R2 v1 2026-06-28T18:38:45.950Z