Geodesic
Spectral sets
Studia Mathematica, Tome 123 (1997) no. 2, pp. 97-107

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

DOI

The paper studies spectral sets of elements of Banach algebras as the zeros of holomorphic functions and describes them in terms of existence of idempotents. A new decomposition theorem characterizing spectral sets is obtained for bounded linear operators. 
J. J.  Koliha. Spectral sets. Studia Mathematica, Tome 123 (1997) no. 2, pp. 97-107. doi: 10.4064/sm-123-2-97-107
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