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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…
math.OA2012
Determining elements in Banach algebras through spectral properties
M. Brešar, Š. Špenko
Let be a Banach algebra. By and we denote the spectrum and the spectral radius of , respectively. We consider the relationship between elements …