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Some approaches to sparse solutions of linear ill-posed problems

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  • UserElena Resmerita (Alpen-Adria University of Klagenfurt)
  • ClockThursday 12 July 2018, 15:00-16:00
  • HouseMR 14.

If you have a question about this talk, please contact Carola-Bibiane Schoenlieb.

During the past two decades it has become clear that $lp$ spaces with $p \in (0,2)$ and corresponding (quasi)norms are appropriate settings for dealing with reconstruction of sparse solutions of ill-posed problems. In this context, the focus of our presentation is twofold. Firstly, since the question of how to choose the exponent $p$ in such settings has been not only a numerical issue, but also a philosophical one, we present a more flexible way of (performing/achieving) sparse regularization by varying exponents. Rather than using norms or quasinorms, we employ F-norms on infinite dimensional spaces. Secondly, we approach the ill-posed problem $Au=f$ by appropriate discretization in the image space. We formulate the so-called least error method in an $l1$ setting and perform the convergence analysis by choosing the discretization level according to both a priori and a posteriori rules. Convergence rates are obtained under source condition (usually) yielding sparsity of the solution.

Joint research with Kristian Bredies, Barbara Kaltenbacher and Dirk Lorenz

This talk is part of the Applied and Computational Analysis series.

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