The Impact of Multiplication Operators on the Ill-Posedness of Inverse Problems

Melina A Freitag

Research output: Book/ReportBook

Abstract

In this work we deal with the degree of ill-posedness of linear operators in Hilbert spaces, where the operator may be decomposed into a compact linear integral operator with a well-known decay rate of singular values and a multiplication operator. This case occurs, for example, for nonlinear operator equations. Then the local degree of ill-posedness is investigated via the Frechet derivative, providing the situation described above. If the multiplier function has got zeroes, the determination of the local degree of ill-posedness is not trivial. We are going to investigate this situation, provide analytical tools as well as their limitations. By using several numerical approaches for computing the singular values we find that the degree of ill-posedness does not change through those multiplication operators. We provide a conjecture, verified by several numerical studies, how those operators influence the singular values. Finally, we analyze the influence of these multiplication operators on Tikhonov regularization and corresponding convergence rates. In this context we also provide a short summary on the relationship between nonlinear problems and their linearizations.
Original languageEnglish
Place of PublicationGermany
PublisherVDM Verlag
Number of pages168
ISBN (Print)978-3639069136
Publication statusPublished - Aug 2008

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Multiplication Operator
Ill-posedness
Inverse Problem
Singular Values
Linear Operator
Fréchet Derivative
Nonlinear Operator Equations
Tikhonov Regularization
Operator
Decay Rate
Integral Operator
Linearization
Multiplier
Nonlinear Problem
Convergence Rate
Numerical Study
Trivial
Hilbert space
Computing
Zero

Cite this

The Impact of Multiplication Operators on the Ill-Posedness of Inverse Problems. / Freitag, Melina A.

Germany : VDM Verlag, 2008. 168 p.

Research output: Book/ReportBook

Freitag, Melina A. / The Impact of Multiplication Operators on the Ill-Posedness of Inverse Problems. Germany : VDM Verlag, 2008. 168 p.
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