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Doubling perturbation sizes and preservation of operator indices in normed linear spaces†
Published online by Cambridge University Press: 24 October 2008
Abstract
We extend the index theory of Fredholm operators in Banach spaces to general operators in normed linear spaces. In so doing we make use of a doubling technique, which we also apply to obtain improved results for the perturbation of semigroups and sesquilinear forms.
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- Research Article
- Information
- Mathematical Proceedings of the Cambridge Philosophical Society , Volume 66 , Issue 2 , September 1969 , pp. 281 - 294
- Copyright
- Copyright © Cambridge Philosophical Society 1969
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