The Noncommutative Singer-Wermer Conjecture and Generalized Skew Derivations

The noncommutative Singer-Wermer conjecture states that every linear derivation on a noncommutative Banach algebra maps into its Jacobson radical. This conjecture is still an open question for more than thirty years. In this paper, the question of when a generalized skew derivation on a Banach algebra has quasinilpotent values is considered and how this question is related to the noncommutative Singer-Wermer conjecture is discussed.