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math.OA2013
Derivations preserving quasinilpotent elements
J. Alaminos, M. Brešar, J. Extremera +2
We consider a Banach algebra with the property that, roughly speaking, sufficiently many irreducible representations of on nontrivial Banach spaces do not vanish on all squ…
math.OA2012
Identifying derivations through the spectra of their values
M. Brešar, B. Magajna, Š. Špenko
We consider the relationship between derivations and of a Banach algebra that satisfy $\s(g(x)) \subseteq \s(d(x))$ for every , where $\s(\, . \,)$ stands for t…