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