Artikelaktionen

2009

Eine Ebene höher

23.07.2009 Lahcen Maniar (Marrakesch) Controllability of Degenerate Parabolic Systems
S10, 14:15-16:00 AG Funktionalanalysis
09.07.2009 Nazife Erkursun (Ankara/Ulm) General view to special operator nets: Lotz-Räbiger nets
S10, 15:15-17:00 AG Funktionalanalysis
09.07.2009 Ulrich Groh (Tübingen) Jacobs-deLeeuw-Glicksberg Zerlegung in W*-Algebren
S10, 14:15-16:00 AG Funktionalanalysis
25.06.2009 Tatiana Shulman (Copenhagen) Stability of relations and projectivity in operator algebras
S10, 14:15-16:00 AG Funktionalanalysis
14.05.2009 Daniel Maier (Tuebingen) Kompakte monothetische Gruppen
S10, 14:15-16:00 AG Funktionalanalysis
07.05.2009 Annette Kopp (Tübingen) Darstellung dynamischer Systeme als Gruppenrotationen und Schiefprodukte
S10, 14:15-16:00 AG Funktionalanalysis
30.04.2009 Retha Heymann (University of Stellenbosch) Fredholm theory in general Banach algebras. Bonus feature: a glimpse of South Africa.: Fredholm operators are characterized by Atkinson’s theorem. By Atkinson’s
theorem, a bounded linear operator on a Banach space X is Fredholm, if and
only if this operator modulo the compact operators is invertible in the Calkin
algebra. This result was used by R. Harte to generalize the concept of Fredholm
operators in L(X) to Fredholm elements in Banach algebras in general. Furthermore,
this led to the introduction of Weyl and Browder elements. In this
talk we will look at this generalization as well as some related results of Harte.
S10, 14:15-16:00 AG Funktionalanalysis
19.02.2009 Alberto Conejero (Valencia) On the dynamics of single operators in chaotic C_0-semigroups: A strongly continuous semigroup is said to be hypercyclic if there
exists some element whose orbit under the semigroup is dense,
and it is said to be chaotic if it is hypercyclic and it has a dense set
of periodic points.
Similar definitions could also be stated for the sequence of powers of a
single operator in the semigroup.
In this talk we explain what can be said about the dynamics of single
operators in a hypercyclic, resp. chaotic C₀-semigroup.
S10, 14:15-16:00 AG Funktionalanalysis
09.02.2009 Sophie Fosson (Torin) Discrete Deconvolution Problems, Decoding Algorithms and Ergodicity: Recovering the input of a system from a noisy lecture of the output is both a typical inverse ill-posed problem and a transmission paradigm. If the input-output relation is given by a convolution integral, we are concerned with the well-known deconvolution problem, which occurs in several scientific frameworks. When the deconvolution system is discrete, i.e. its input is quantized and the output is sampled, we can develop an original information-theoretic analysis and design an encoding-decoding scheme to tackle it. We propose different decoding methods to identify the input, focussing on a particular class of suboptimal, causal algorithms achieving good performance. These algorithms can be theoretically described by means of Markov Processes and Ergodic Theory.
S10, 14:15-16:00 AG Funktionalanalysis
05.02.2009 Donald I. Cartwright (Sydney) The spectrum of the averaging operator on a network: I shall be talking about some joint work I did with
Wolfgang Woess (Graz). We consider a countable connected graph, view it as a one-complex X¹,
and define the natural operator A which averages
functions over balls of radius 1. Our results include the
calculation of the spectrum of this operator on L²(X¹).
S10, 17:15-19:00 AG Funktionalanalysis
22.01.2009 Shangquan Bu (Beijing) Operator-valued Fourier multipliers on Hardy spaces and applications
S10, 15:15-17:00 AG Funktionalanalysis
08.01.2009 Anke Kalauch (Dresden) Stability radii for positive systems
S10, 14:15-16:00 AG Funktionalanalysis
30.12.2008 Klaus Engel (L'Aquila) Überlegungen zum Erreichbarkeitsraum bei Randkontrollen
S10, 10:15-12:00 AG Funktionalanalysis

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Artikelaktionen

2009