English

Non p-norm approximated Groups

Group Theory 2019-01-29 v2 Algebraic Topology Functional Analysis

Abstract

It was shown in a previous work of the first named author with De Chiffre, Glebsky and Thom that there exists a finitely presented group which cannot be approximated by almost-homomorphisms to the unitary groups U(n)U(n) equipped with the Frobenius norms (a.k.a as L2L^2 norm, or the Schatten-2-norm). In his ICM18 lecture, Andreas Thom asks if this result can be extended to general Schatten-p-norms. We show that this is indeed the case for 1<p<1<p< \infty.

Cite

@article{arxiv.1807.06790,
  title  = {Non p-norm approximated Groups},
  author = {Alexander Lubotzky and Izhar Oppenheim},
  journal= {arXiv preprint arXiv:1807.06790},
  year   = {2019}
}

Comments

12 pages

R2 v1 2026-06-23T03:05:23.516Z