Review

Radius preserving (semi)regularities in Banach algebras

Published in: Quaestiones Mathematicae
Volume 42 , issue 6 , 2019 , pages: 811–822

DOI: 10.2989/16073606.2018.1501439

Author(s): H. Raubenheimer Department of Pure and Applied Mathematics, , A. Swartz Department of Pure and Applied Mathematics,

Keywords: 46H05 , 47A10 , 47A53 , 46H05 , 47A10 , 47A53

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Abstract

In this note we investigate regularities (semiregularities) R and S in a Banach algebra A satisfying S ⊂ R and the corresponding spectra σ_S and σ_R Satisfying

sup {|λ| : λ ∈ σ_R(a)} = sup{|λ| : λ ∈ σ_S (a)}

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Review

Radius preserving (semi)regularities in Banach algebras

Abstract

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