Doubly power-bounded elements with finite spectrum in Banach algebras admit a spectral decomposition extending Gelfand's theorem, with a generalization of Koehler-Rosenthal results and initial links to commutativity.
Iliˇ sevi´ c, Generalizedn-circular projections onJ B∗-triples, Contemp
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Spectral decomposition of doubly power-bounded elements in Banach algebras
Doubly power-bounded elements with finite spectrum in Banach algebras admit a spectral decomposition extending Gelfand's theorem, with a generalization of Koehler-Rosenthal results and initial links to commutativity.