The behavior of functions of operators under perturbations

Details The behavior of functions of operators under perturbations The behavior of functions of operators under perturbations

2009-04-10

arxiv.org/abs/0904.1761v1

Mathematics

Functional Analysis

37 pages

Scientific paper

This is a survey article. We consider different problems in connection with the behavior of functions of operators under perturbations of operators. We deal with three classes of operators: unitary operators, self-adjoint operators, and contractions. We study operator Lipschitz and operator differentiable functions. We also study the behavior of functions under perturbations of an operator by an operator of Schatten--von Neumann class $\bS_p$ and apply the results to the Livschits--Krein and Koplienko--Neidhardt trace formulae. We also include in this survey article recent unexpected results obtained in a joint paper with Aleksandrov on operator H\"older--Zygmund functions.

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