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Perturbation Theory for Linear Operators: (2nd ed. 1995)

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 XXI, 623 p.

£49.99