English

A note on a question of Garth Dales: Arens regularity as a three space property

Functional Analysis 2025-12-08 v3

Abstract

Garth Dales asked whether a Banach algebra A\mathcal{A} having an Arens regular closed ideal J\mathcal{J} with Arens regular quotient A/J\mathcal{A}/\mathcal{J} is necessarily Arens regular. We prove in this note that, for a class of Banach algebras including the standard algebras in harmonic analysis, Garth's conditions force the algebra to be even reflexive. We also give examples of Banach algebras with Garth's conditions, that are not Arens regular.

Keywords

Cite

@article{arxiv.2407.09947,
  title  = {A note on a question of Garth Dales: Arens regularity as a three space property},
  author = {Mahmoud Filali and Jorge Galindo},
  journal= {arXiv preprint arXiv:2407.09947},
  year   = {2025}
}

Comments

The examples in Section 2 have been corrected