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Displaying similar documents to “A note on the spectral mapping theorem”

Axiomatic theory of spectrum III: semiregularities

Vladimír Müller (2000)

Studia Mathematica

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We introduce and study the notions of upper and lower semiregularities in Banach algebras. These notions generalize the previously studied notion of regularity - a class is a regularity if and only if it is both upper and lower semiregularity. Each semiregularity defines in a natural way a spectrum which satisfies a one-way spectral mapping property (the spectrum defined by a regularity satisfies the both-ways spectral mapping property).