English

Zero Lie product determined Banach algebras, II

Functional Analysis 2017-09-28 v1

Abstract

A Banach algebra AA is said to be zero Lie product determined if every continuous bilinear functional φ ⁣:A×AC\varphi \colon A\times A\to \mathbb{C} satisfying φ(a,b)=0\varphi(a,b)=0 whenever ab=baab=ba is of the form φ(a,b)=ω(abba)\varphi(a,b)=\omega(ab-ba) for some ωA\omega\in A^*. We prove that AA has this property provided that any of the following three conditions holds: (i) AA is a weakly amenable Banach algebra with property B\mathbb{B} and having a bounded approximate identity, (ii) every continuous cyclic Jordan derivation from AA into AA^* is an inner derivation, (iii) AA is the algebra of all n×nn\times n matrices, where n2n\ge 2, over a cyclically amenable Banach algebra with a bounded approximate identity.

Keywords

Cite

@article{arxiv.1709.09432,
  title  = {Zero Lie product determined Banach algebras, II},
  author = {J. Alaminos and M. Bresar and J. Extremera and A. R. Villena},
  journal= {arXiv preprint arXiv:1709.09432},
  year   = {2017}
}