Ruston elements and fredholm theory relative to arbitrary homomorphisms Page 1 Quaestiones
Mathematicae 34(2011), 341–359. c⃝ 2011 NISC Pty Ltd, www.nisc.co.za RUSTON ELEMENTS …

SpringerBriefs in Mathematics showcases expositions in all areas of mathematics and
applied mathematics. Manuscripts presenting new results or a single new result in a …

In this paper, we give another definition of Ruston elements and almost Ruston elements,
which is equivalent to the definitions given by Mouton and Raubenheimer in the case that …

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SpringerLink Log in Menu Find a journal Publish with us Search Cart 1.Home 2.Positivity …

By considering arbitrary mappings ω from a Banach algebra A into the set of all nonempty,
compact subsets of the complex plane such that for all a∈ A, the set ω (a) lies between the …

Radius preserving (semi)regularities in Banach algebras Page 1 Quaestiones
Mathematicae 2019, 42(6): 811–822 c⃝ 2018 NISC (Pty) Ltd http://dx.doi.org/10.2989/16073606.2018.1501439 …

REGULARITY-TYPE PROPERTIES OF THE BOUNDARY SPECTRUM IN BANACH
ALGEBRAS 1. Introduction. The boundary spectrum in Banach algebras Page 1 ROCKY …

Characterisations of the radical in a Banach algebra Page 1 Filomat 37:5 (2023), 1449–1459
https://doi.org/10.2298/FIL2305449R Published by Faculty of Sciences and Mathematics …

In this second edition of the “bluffer's guide”, we have corrected as many misprints and typos
as we could identify in the first and made some additions to the bibliography. We have also …