Geodesic
Spectral characterizations of central elements in Banach algebras
Studia Mathematica, Tome 120 (1996) no. 1, pp. 47-52

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DOI

Let A be a complex unital Banach algebra. We characterize elements belonging to Γ(A), the set of elements central modulo the radical. Our result extends and unifies several known characterizations of elements in Γ(A). 
Matej Brešar. Spectral characterizations of central elements in Banach algebras. Studia Mathematica, Tome 120 (1996) no. 1, pp. 47-52. doi: 10.4064/sm-120-1-47-52
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