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• W2076459223 abstract "The object of this paper is threefold. First, we investigate in a Hilbert space setting the utility of approximate source conditions in the method of Tikhonov–Phillips regularization for linear ill-posed operator equations. We introduce distance functions measuring the violation of canonical source conditions and derive convergence rates for regularized solutions based on those functions. Moreover, such distance functions are verified for simple multiplication operators in L2(0, 1). The second aim of this paper is to emphasize that multiplication operators play some interesting role in inverse problem theory. In this context, we give examples of non-linear inverse problems in natural sciences and stochastic finance that can be written as non-linear operator equations in L2(0, 1), for which the forward operator is a composition of a linear integration operator and a non-linear superposition operator. The Fréchet derivative of such a forward operator is a composition of a compact integration and a non-compact multiplication operator. If the multiplier function defining the multiplication operator has zeros, then for the linearization an additional ill-posedness factor arises. By considering the structure of canonical source conditions for the linearized problem it could be expected that different decay rates of multiplier functions near a zero, for example the decay as a power or as an exponential function, would lead to completely different ill-posedness situations. As third we apply the results on approximate source conditions to such composite linear problems in L2(0, 1) and indicate that only integrals of multiplier functions and not the specific character of the decay of multiplier functions in a neighbourhood of a zero determine the convergence behaviour of regularized solutions. Copyright © 2005 John Wiley & Sons, Ltd." @default.
• W2076459223 created "2016-06-24" @default.
• W2076459223 creator A5059831151 @default.
• W2076459223 date "2005-01-01" @default.
• W2076459223 modified "2023-10-08" @default.
• W2076459223 title "Approximate source conditions in Tikhonov-Phillips regularization and consequences for inverse problems with multiplication operators" @default.
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• W2076459223 doi "https://doi.org/10.1002/mma.686" @default.
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