A+ CATEGORY SCIENTIFIC UNIT

PDF files of articles are only available for institutions which have paid for the online version upon signing an Institutional User License.

Leinert sets and complemented ideals in Fourier algebras

Volume 239 / 2017

Michael Brannan, Brian Forrest, Cameron Zwarich Studia Mathematica 239 (2017), 273-296 MSC: Primary 43A15, 43A22; Secondary 46H10. DOI: 10.4064/sm8733-3-2017 Published online: 26 March 2017

Abstract

We show how complemented ideals in the Fourier algebra $A(G)$ of $G$ arise naturally from a class of thin sets known as Leinert sets. Moreover, we present an explicit example of a closed ideal in $A(\mathbb {F}_{N})$, where $\mathbb {F}_{N}$ is the free group on $N \ge 2$ generators, that is complemented in $A(\mathbb {F}_{N})$ but it is not completely complemented. Then by establishing an appropriate extension result for restriction algebras arising from Leinert sets, we show that any almost connected group $G$ for which every complemented ideal in $A(G)$ is also completely complemented must be amenable.

Authors

  • Michael Brannan
  • Brian Forrest
  • Cameron Zwarich

Search for IMPAN publications

Query phrase too short. Type at least 4 characters.

Rewrite code from the image

Reload image

Reload image