A note on Aupetit's perturbation theorem

Research Article

A note on Aupetit's perturbation theorem

Published in: Quaestiones Mathematicae
Volume 44 , issue 5 , 2021 , pages: 625–635
DOI: 10.2989/16073606.2020.1730999
Author(s): Sonja Mouton , South Africa
Keywords: 46H10 , 47A10 , 46H10 , 47A10
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Abstract

We investigate the different forms of Aupetit's perturbation theorem and its variants, and provide some generalisations.
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