English

On a conjecture of Atiyah

Geometric Topology 2015-06-26 v1 Algebraic Topology K-Theory and Homology

Abstract

In this note we explain how the computation of the spectrum of the lamplighter group from \cite{Grigorchuk-Zuk(2000)} yields a counterexample to a strong version of the Atiyah conjectures about the range of L2L^2-Betti numbers of closed manifolds.

Cite

@article{arxiv.math/0009175,
  title  = {On a conjecture of Atiyah},
  author = {R. I. Grigorchuk and P. Linnell and T. Schick and A. Zuk},
  journal= {arXiv preprint arXiv:math/0009175},
  year   = {2015}
}

Comments

8 pages, A4 paper

R2 v1 2026-07-22T16:34:48.825Z