Solution smoothness of ill-posed equations in Hilbert spaces: four concepts and their cross connections

Numerical solution of ill-posed operator equations requires regularization techniques. The convergence of regularized solutions to the exact solution can be usually guaranteed, but to also obtain estimates for the speed of convergence one has to exploit some kind of smoothness of the exact solution....

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Vydané v:Applicable analysis Ročník 91; číslo 5; s. 1029 - 1044
Hlavný autor: Flemming, Jens
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Abingdon Taylor & Francis Group 01.05.2012
Taylor & Francis Ltd
Predmet:
Approximation
Convergence
Euclidean space
Exact solutions
Hilbert space
ill-posed problem
Inequalities
Mathematical analysis
Mathematical functions
Mathematical models
Mathematical problems
Numerical analysis
Smoothness
source condition
variational inequality
ISSN:0003-6811, 1563-504X
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Shrnutí:Numerical solution of ill-posed operator equations requires regularization techniques. The convergence of regularized solutions to the exact solution can be usually guaranteed, but to also obtain estimates for the speed of convergence one has to exploit some kind of smoothness of the exact solution. We consider four such smoothness concepts in a Hilbert space setting: source conditions, approximate source conditions, variational inequalities, and approximate variational inequalities. Besides some new auxiliary results on variational inequalities the equivalence of the last three concepts is shown. In addition, it turns out that the classical concept of source conditions and the modern concept of variational inequalities are connected via Fenchel duality.
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ISSN:0003-6811
1563-504X
DOI:10.1080/00036811.2011.563736