A note on commutator-simple algebras

Abstract

We investigate the property of commutator-simplicity in algebras from both algebraic and analytic perspectives. We demonstrate that a large class of algebras possess this property. As an analytic analog, we introduce the concept of topological commutator-simplicity for Banach algebras and establish that a \(\sigma \)-unital \(C^{*}\)-algebra is topological commutator-simple if and only if its multiplier algebra is. Furthermore, we explore the applications of commutator-simplicity to certain equations involving commutators, emphasizing its relevance in the study of derivations. Specifically, we obtain that every continuous local derivation on \(L^1(G,\omega )\) is a derivation when G is a unimodular locally compact group with a diagonal bounded weight \(\omega \).