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Perturbation Theory for Linear Operators, Paperback by Kato, Tosio, ISBN 354058661X, ISBN-13 9783540586616, Like New Used, Free P&P in the UK From the reviews: "[…] An excellent textbook in the theory of linear operators in Banach and Hilbert spaces. It is a thoroughly worthwhile reference work both for graduate students in functional analysis as well as for researchers in perturbation, spectral, and scattering theory. […] I can recommend it for any mathematician or physicist interested in this field." Zentralblatt MATH
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