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On a certain class of subspectra. (English) Zbl 0763.46037
Summary: The aim of this paper is to characterize a class of subspectra for which the geometric spectral radius is the same and depends only upon a commuting $$n$$-tuple of elements of a complex Banach algebra. We prove also that all these subspectra have the same capacity.

##### MSC:
 46H05 General theory of topological algebras
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