Visitors
Visitors give typically a talk in the reseach seminar Analysis, Stochastics and Mathematical Physics, which
takes place on Wednesday at 15.30 in the Reichenhainer Strasse 41, 7. floor, room 705.
If there are several talks in one week, there is an additonal talk slot out of schedule.
Sometimes the talks are scheduled in the Cemnitzer Mathematisches Colloquium,
which takes place on Thursday at 16.00 in Reichenhainer Strasse 70, room B202.
Visitors 2013
| Visitor: |
Guergui Dimitrov Raykov |
| Institution: |
Pontificia Universidad Católica de Chile, Santiago, Chile |
| Stay: |
22.-24. January 2013 |
| Title: |
Pontificia Universidad Católica de Chile |
| Occasion: |
Seminar |
| Date: |
23. January 2013, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Abstract: |
Let H_0 be the 3D Schroedinger operator with constant magnetic field, V be an electric potential which decays sufficiently fast at infinity, and let H = H_0 + V. First, we consider the asymptotic behaviour of the Krein spectral shift function (SSF) for the operator pair (H,H_0) near the Landau levels which play the role of thresholds in the spectrum of H_0. We show that the SSF has singularities near the Landau levels, and describe these singularities in terms of appropriate Berezin - Toeplitz operators. Further, we define the resonances for the operator H and investigate their asymptotic distribution near the Landau levels. We show that under suitable assumptions on the potential V there are infinitely many resonances near every fixed Landau level. We find the main asymptotic term of the corresponding resonance counting function which again is expressed in terms of the Berezin - Toeplitz operators arising in the description of the SSF singularities. If time permits, extensions to magnetic Pauli and Dirac operators will be discussed briefly. The talk is based on joint works with J.-F. Bony (Bordeaux), V. Bruneau (Bordeaux), and C. Fernández (Santiago de Chile). |
| Visitor: |
Felix Pogorzelski |
| Institution: |
FSU Jena |
| Stay: |
07.-10. January 2013 |
| Title: |
Convergence theorems for graph sequences |
| Occasion: |
Seminar |
| Date: |
9. January 2013, 12.30 h |
| Location: |
Seminar room 2/41/705 |
| Abstract: |
The talk is devoted to limit theorems for a class of Banach space-valued functions defined on graphs. We describe the concept of limits of graph sequences in terms of statistical distributions of possibly infinite graphs. In this context, we will have to distinguish between weak and strong convergence. Further, we demonstrate how the convergence of the functions under consideration relates to the notion of hyperfiniteness for graph sequences. We conclude by mentioning some open questions. |
Visitors 2012
| Visitor: |
Helge Krüger |
| Institution: |
Caltech Department of Mathematics, Pasadena, California |
| Stay: |
18. - 20. December 2012 |
| Title: |
Dynamical localization for the almost Mathieu operator |
| Occasion: |
Seminar |
| Date: |
19. December 2012, 15.30 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Felix Otto |
| Institution: |
MPI Leipzig |
| Title: |
Stochastische Homogenisierung |
| Occasion: |
Chemnitzer Mathematisches Colloquium |
| Date: |
29. November 2012, 16.00 h |
| Location: |
Room B202, RH 70 |
| Visitor: |
Erich Novak |
| Institution: |
FSU Jena |
| Stay: |
6.-7. November 2012 |
| Title: |
Optimal Approximation of Elliptic Problems by Linear and Nonlinear Mappings |
| Occasion: |
Seminar |
| Date: |
7. November 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Abstract: |
We study the optimal approximation of the solution of an operator
equation $A(u) = f$
by linear mappings of rank $n$ and compare this with the best
$n$-term approximation with respect to an optimal Riesz basis.
We consider
worst case errors, where $f$ is an element of the unit ball of
a Hilbert space, or of a more general space, such as a Besov space.
We apply our results to boundary value problems for
elliptic PDEs that are given by an isomorphism
$
A : H^s_0 (\Omega) \to H^{-s} (\Omega) ,
$
where $s >0$ and $\Omega$ is an arbitrary bounded Lipschitz
domain in $\R^d$.
We prove, in the case of Hilbert spaces,
that approximation by linear mappings is as good
as the best $n$-term approximation with respect to an optimal
Riesz basis.
We discuss why nonlinear approximation still is
important for the approximation of elliptic problems
and we also discuss results for Besov spaces.
|
| Visitor: |
Marlis Bärthel |
| Institution: |
FSU Jena |
| Stay: |
16.-17. October 2012 |
| Title: |
Robin Hood an der Börse |
| Zusammenfassung: |
Viele Befürworter der Einführung einer Finanz-Transaktionssteuer
(auch als Robin-Hood-Steuer bekannt) haben Hoffnungen auf mehr Ruhe und Stabilität am Finanzmarkt.
Doch ein einfaches Modell im Rahmen der nicht-kooperativen Spieltheorie lässt genau das Gegenteil
vermuten. Bei kleinen, fairen Zwei-Personen-Matrixspielen bewirkt eine Gewinnbesteuerung einen Anstieg im Erwarteten Transfer!
Je höher die Steuer - umso höher der Transfer: Ein überraschendes Paradoxon, welches aus mathematischer Sicht belegt, dass Steuern
ganz klar kein Allheilmittel zur Eindämmung riskanten Spielverhaltens sind
|
| Occasion: |
Science-Slam Vortrag, organisiert von der Fachschaft Mathematik (Herr Stephan Schleicher) |
| Date: |
16. October 2012, 10.45 h |
| Location: |
N/101 |
| |
|
| Title: |
Phänomene bei der Besteuerung von Matrixspielen |
| Occasion: |
Seminar |
| Date: |
17. October 2012, 15.30 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Christoph Richard |
| Institution: |
Universität Erlangen |
| Stay: |
10.-12. October 2012 |
| Title: |
Dynamical properties of almost repetitive Delone sets |
| Abstract: |
The non-periodic Penrose tiling of the plane exhibits a strong
regularity property called linear repetitivity. This regularity is
reflected in strict ergodicity of an associated dynamical system arising
from the tiling's translation orbit closure. We introduce relaxed
versions of linear repetitivity for uniformly discrete point sets, which
still lead to strictly ergodic dynamical systems. Examples are periodic
point sets with almost periodic modulations, and primitive substitutions
tilings finite local complexity with respect to the Euclidean group with
dense tile orientations. |
| Occasion: |
Seminar |
| Date: |
10. October 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Norbert Peyerimhoff |
| Institution: |
University of Durham |
| Stay: |
18.-26. August 2012 |
| Visitor: |
Matthias Keller |
| Institution: |
FSU Jena |
| Stay: |
30. July - 1. August 2012 |
| Title: |
Antibäume - das perfekte Gegenbeispiel |
| Occasion: |
Seminar |
| Date: |
31. July 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Torsten Ehrhardt |
| Institution: |
University of California |
| Title: |
Lineare Statistiken von Zufallsmatrizen |
| Occasion: |
Seminar |
| Date: |
18. July 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Friedrich Philipp |
| Institution: |
TU Berlin |
| Title: |
Spectral properties of non-selfadjoint operators |
| Occasion: |
Seminar |
| Date: |
11. July 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Francisco Hoecker-Escuti |
| Institution: |
Universite Paris 13 |
| Stay: |
18.-23. June 2012 |
| Title: |
The Anderson model at small disorder and low density regimes |
| Occasion: |
Seminar |
| Date: |
20. June 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Peter Gmeiner |
| Institution: |
Universität Erlangen |
| Stay: |
22.-24. May 2012 |
| Title: |
Laplace Operatoren auf Hypergraphen |
| Abstract: |
Im Vortrag werden verschiedene Laplace-Operatoren für Hypergraphen vorgestellt, sowie bekannte Resultate über deren Spektren. Insbesondere werden bekannte isoperimetrische Ungleichungen für Hypergraphen vorgestellt. Dabei wird auch auf die grundlegende Problematik der Definition eines Laplace-Operators auf Hypergraphen eingegangen (viele der bisher vorgeschlagenen Definitionen sind letztlich Laplace-Operatoren auf speziellen Graphen).
|
| Occasion: |
Seminar |
| Date: |
23. May 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Wolfgang Spitzer |
| Institution: |
Fern-Universität Hagen |
| Stay: |
24.-26. April 2012 |
| Title: |
Spektrale Zustandsdichte von Schrödinger-Operatoren auf Bäumen |
| Abstract: |
Sei $H:=\Delta + \kappa q$ der Hamiltonian des Anderson-Modells
auf dem (unendlichen) $d$-regul\"aren Baum, wobei $\Delta$ die Adjazenzmatrix,
$q$ ein geeignetes Zufallspotential, $\kappa\ge0$ und $d\ge2$ ist. Des weiteren sei
$(X_n)$ eine geeignete Folge von $d$-regul\"aren Graphen mit $|X_n|\to\infty$
und $(H_n)$ mit $H_n:=\Delta_n + \kappa q$ die entsprechende Folge von
Anderson-Hamiltonians auf den Graphen $X_n$ mit Adjazenzmatrix $\Delta_n$.
Wir zeigen, dass die Zustandsdichte von $H_n$ gegen die Zustandsdichte
von $H$ konvergiert und damit ein klassisches Resultat von B.~McKay f\"ur
$\kappa>0$ verallgemeinern. F\"ur $\kappa=0$ beweisen wir Absch\"atzungen
der Konvergenzgeschwindigkeit.
|
| Date: |
25. April 2012, 15.45 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Anastasia Golovina |
| Institution: |
Bashkir State Pedagogical University, Russia |
| Stay: |
5.-18. February 2012 |
| Title: |
On the resolvents of the elliptic operators with distant perturbations |
| Abstract: |
We consider a matrix periodic elliptic operator in a multidimensional space with distant perturbations. The order of unperturbed is even and arbitrary, while the perturbations are described by arbitrary abstract localized operators. The number of perturbations is abitrary but fixed. The main result is the explicit formula for the resolvent of the perturbed operator. This formula also allows to represent the resolvent as a convergent asymptotic series. In addition to the general result, we give a series of examples of both the unperturbed operator and perturbations. |
| Date: |
15. February 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Denis Borisov |
| Institution: |
Bashkir State Pedagogical University, Russia |
| Stay: |
5.-18. February 2012 |
| Visitor: |
Caroline Kurig |
| Institution: |
Johannes Gutenberg-Universität Mainz |
| Title: |
Die integrierte Zustandsdichte für den Wilson-Dirac-Operator |
| Occasion: |
Seminar |
| Date: |
1. February 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Nihat Ay |
| Institution: |
Max-Planck-Institut fuer Mathematik in den Naturwissenschaften, Leipzig |
| Title: |
Eine geometrische Sicht auf den Begriff der Komplexitaet |
Abstract: |
In meinem Vortrag skizziere ich zunaechst einen generellen geometrischen
Zugang zur Quantifizierung von Komplexitaet. Danach spezifiziere ich
diesen im Kontext der Informationsgeometrie und stelle Bezuege her zu
bekannten Komplexitaetsmassen. Ich gehe dann auf die zentralen Ergebnisse
ein, die sich auf die Maximierung von Komplexitaet beziehen. Schliesslich
diskutiere ich die Beziehung zwischen Komplexitaet und Kausalitaet.
|
| Occasion: |
Chemnitzer Mathematisches Colloquium |
| Date: |
26. January 2012, 16.00 h |
| Location: |
Room B202, RH 70 |
| Visitor: |
Felix Pogorzelski |
| Institution: |
Lehrstuhl für Analysis, FSU Jena |
| Title: |
Ein Banachraum-wertiger Ergodensatz für mittelbare Gruppen |
| Occasion: |
Seminar |
| Date: |
25. January 2012, 16.00 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Tobias Oertel-Jäger |
| Institution: |
TU Dresden, Institut für Analysis |
| Stay: |
18. January 2012 |
| Title: |
Dimensions of attractors in pinched skew products |
| Abstract: |
We study dimensions of strange non-chaotic attractors and their associated physical
measures in so-called pinched skew products, introduced by Grebogi and his coworkers in 1984. The
main results are that the Hausdorff dimension, the pointwise dimension and the information dimension
are all equal to one, although the box counting dimension is known to be two.
Our findings confirm a conjecture by Ding, Grebogi and Ott from 1989.
The talk will concentrate on box dimension and Hausdorff dimension. Joint work with Maik Gr�ger (Bremen).
|
| Occasion: |
Seminar |
| Date: |
18. January 2012, 15.45 h |
| Location: |
Seminar room 2/41/705 |
Visitors 2011
| Visitor: |
Amal Taarabt |
| Stay: |
2.-11. December 2011 |
| Title: |
Spectral properties of dynamical localization for Schroedinger operators |
| Abstract: |
Sie beschaeftigt sich mit der Frage ob (und unter welchen Bedingungen) Dynamische und spektrale+exponentielle Lokalisierung aequivalent sind. |
| Occasion: |
Seminar |
| Date: |
7. December 2011, 15.30 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Constanza Rojas-Molina |
| Institution: |
Université de Cergy-Pontoise |
| Stay: |
27. November - 9. December 2011 |
| Visitor: |
Thomas Blesgen |
| Institution: |
MPI, Leipzig |
| Title: |
Phasenfeldgleichungen mit geometrisch-linearer Elastizität |
| Abstract: |
A new class of phase field models is derived and studied where the
elastic energy, being quasiconvex, incorporates the effects of
microstructure formation on smaller length scales.
First, a review of the classical phase field models is given together
with an introduction of the used new elasticity theory. Next,
at the example of the elastic Cahn-Hilliard equations, global existence of weak solutions in certain microstructural regimes is proved.
Numerical simulations in 2D study the properties of the new model.
Das Thema ist mit dem Vortrag von Helmut Abels verwandt. |
| Occasion: |
Seminar |
| Date: |
9. November 2011, 15.30 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Helmut Abels |
| Institution: |
Fakultät für Mathematik, Universität Regensburg |
| Title: |
Diffuse Grezschichtmodelle von Zwei-Phasenflüssen |
| Occasion: |
Chemnitzer Mathematisches Colloquium |
| Date: |
3. November 2011, 16.00 h |
| Location: |
Room B202, RH 70 |
| Visitor: |
Ilhan Usta |
| Institution: |
Anadolu University, Department of Statistics, Turkey |
| Stay: |
26.-30. September 2011 |
| Title: |
Introduction into linear regression models |
| Occasion: |
Seminar |
| Date: |
28. September 2011, 15.30 h |
| Title: |
On the performance of the flexible maximum entropy distributions within partially adaptive estimation |
| Occasion: |
Seminar |
| Date: |
29. September 2011, 13.30 h |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Constanza Rojas-Molina |
| Institution: |
Université de Cergy-Pontoise |
| Stay: |
11.-23. July 2011 |
| Visitor: |
Norbert Peyerimhoff |
| Institution: |
University of Durham |
| Stay: |
10.-15. July 2011 |
Title: |
Spektrale Darstellungen von eckentransitiven Graphen, Archimedische Körper und endliche Coxetergruppen |
Preprint: |
http://arxiv.org/abs/1106.2509 |
| Occasion: |
Seminar |
| Date: |
14. July 2011, 11.30 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Slim Ayadi |
| Institution: |
Georgia Tech, USA |
| Stay: |
3.-23. July 2011 |
Title: |
Spectral Properties of Random Matrices |
Abstract: |
In this talk, we have two parts. In the first part,
one studies the asymptotic behavior of the distribution of the
eigenvalues of the ensemble of random matrices which generalizes the
Wigner ensemble and the ensembles of band random matrices. More
precisely, one considers a matrix with a random band of width, this
model motivated by a model of percolation to long-range. One studies
this ensemble aiming to obtain the semicircle law and to obtain a
support of the universality conjecture for the band matrices. At the end, one gives some results about the random matrix operators of the long-range percolation model.
In the second part, one studies the ensemble of dilute random
matrices aiming to have an improvement of the convergence to the
semicircle law and to show that this ensemble and the Wigner
ensemble have the same class of universality.
|
| Occasion: |
Seminar |
| Date: |
6. July 2011, 15.30 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Constanza Rojas-Molina |
| Institution: |
Université de Cergy-Pontoise |
| Stay: |
26.-28. April 2011 |
Title: |
Characterization of the Anderson metal-insulator transition for non ergodic random operators |
Abstract: |
We investigate the Anderson metal-insulator transition for non ergodic random Schrödinger operators in both annealed and
quenched regimes, based on a dynamical approach of localization, improving known results for ergodic operators into this more
general setting. In the procedure, we reformulate the Bootstrap Multiscale Analysis of Germinet and Klein to fit the non
ergodic setting and we obtain "uniform" Wegner Estimates, needed to perform this adapted Multiscale Analysis. As an
application we study operators with Anderson-type potentials modeling aperiodic solids, where the impurities lie on a Delone
set rather than a lattice, yielding a break of ergodicity. |
| Occasion: |
Seminar |
| Date: |
27. April 2011, 15.30 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Christoph Richard |
| Institution: |
Friedrich-Alexander-Universität Erlangen-Nürnberg |
| Stay: |
13.-15. April 2011 |
Title: |
Ergodic properties of randomly coloured point sets |
Abstract: |
In order to analyse spectral properties of an aperiodically ordered point set such as the vertex set of the Penrose tiling, it has proven useful to consider the closure of the collection of all translates of the given point set, with respect to a suitable topology. In particular, there is a geometric characterisation of unique ergodicity in terms of uniform pattern frequencies. We give such a characterisation within a generalised setup, where we allow for a uniformly discrete point set in a locally compact metric space with a continuous and proper action of a locally compact, metric, unimodular group, which admits suitable averaging sequences. We will discuss applications of our setup to random colourings and graphs. This is joint work with Peter Müller, Munich. |
| Occasion: |
Seminar |
| Date: |
13. April 2011, 15.30 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Maria Korotyaeva |
| Institution: |
Humboldt Universität Berlin |
| Stay: |
16.-17. February 2011 |
Title: |
The inverse spectral problem for the periodic Jacobi matrices |
Abstract: |
There is a known method (see e.g. [KoKu]) to solve the inverse spectral problem for the
periodic Jacobi matrices using the Marchenko-Ostrovsky mapping, i.e. the vertical slits
on the quasi-momentum domain plus the Neumann eigenvalues. We solve this problem
analogously in terms of the Dirichlet eigenvalues.
In particular, we give an alternative proof for the following crucial fact: the Dirichlet
eigenvalues and the corresponding so-called norming constants are canonically conjugate
variables, which yields that their gradients are linearly independent. |
| Occasion: |
Seminar |
| Date: |
16. February 2011, 17.15 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Denis Borisov |
| Institution: |
Bashkir State Pedagogical University, Russia |
| Stay: |
5.-19. February 2011 |
Title: |
On eigenvalue problems and
the modified Birman Schwinger principle |
| Occasion: |
Seminar |
| Date: |
15. February 2011, 17.15 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Sebastian Haeseler |
| Institution: |
FSU Jena |
Talk: |
Stochastically complete metric graphs |
| Occasion: |
Seminar |
| Date: |
05. January 2011, 15.30 |
| Location: |
Seminar room 2/41/705 |
Visitors 2010
| Visitor: |
Michael Theß und Herr Andre Müller |
| Institution: |
Prudsys AG |
Talk: |
Vorstellung der Forschung der Prudsys AG |
| Abstract: |
Dr. Michael Theß (Vorstand) und Herr Andre Müller (Leiter der
Forschung) möchten gern die Strategie der Firma für die nächste Zeit
vorstellen und Möglichkeiten für eine Zusammenarbeit mit der Fakultät
ausloten. Der momentan angedachte Focus liegt auf
folgenden Punkten:
1)
Kurze Vorstellung der Prudsys Xelopes-Bibliothek,
mit dem Ziel, dass Mathematik-Studenten die Bibliothek
nutzen, und wer Interesse hat, daran entwickeln könnten.
(Möglichkeiten deren Lizensierung durch die TU, Seminar z.B. im
Rahmen eines Computer-Praktikums durch Firmenvertreter).
2)
Sondierung von Möglichkeiten der Zusammenarbeit mit
universitärem Partner, insbesondere auf dem Gebiet der
Statistik/Stochastik.
Die Prudsys AG ist eine regionale Firma, deren Produktentwicklung von
der Anwendung fortgeschrittener mathematischer Technologien lebt.
Deshalb gibt es u.U. auch weitere Punkte, die für beide Seiten
interessant sein könnten.
|
| Occasion: |
Als Ersatz des Forschungs-Seminars |
| Date: |
8. Dezember 2010, 15.30h, room 638 |
| Visitor: |
Hillel Raz |
| Institution: |
Cardiff University |
| Stay: |
17.-19. November 2010 |
Talk: |
Minimal Partitions of Quantum Graphs |
| Abstract: |
The eigenfunction of the $n$th eigenvalue of the Laplacian ($-d^2/dx^2$) on a bounded regular domain partitions that domain into $k$ subdomains (known as nodal domains). Courant's nodal domain theorem states that $k\le n$. We study the relationship between the $n$th eigenfunction of the Laplacian on a quantum graph (a graph where each edge has a positive length with specific boundary conditions at the vertices) and partitions of the graph into $n$ parts. We describe a procedure of attaining eigenfunctions, and hence the spectrum, by investigating these partitions, in particular minimal ones. The minimal partitions are found by assigning a score to each partition which is the maximum of the first eigenvalue of the Laplacian over each part of the partition. No prior knowledge of quantum graphs is necessary. This is joint work with Ram Band, Gregory Berkolaiko and Uzy Smilanskybased and is based partially on results by Bernard Helffer, Thomas Hoffmann-Ostenhoff, Susanna Terracini et al.
|
| Occasion: |
Seminar |
| Date: |
18. November 2010, 11.15h, room 705 |
| Visitor: |
Wolfram Bauer |
| Institution: |
Universität Göttingen |
| Stay: |
10.-11. November 2010 |
Talk: |
Sub-Riemannian structures and related operators |
Abstract: |
PDF-file |
| Occasion: |
Seminar |
| Date: |
10. November 2010, 15.30 |
| Visitor: |
Jens Bolte |
| Institution: |
University of London |
| Stay: |
26.-28. October 2010 |
Talk: |
Vielteilchensysteme mit singulärer Zweiteilchen-Wechselwirkung
auf Graphen |
Abstract: |
Quantengraphen sind Modelle für Quantensysteme,
die auf den Kanten eines kompakten, metrisch Graphen leben.
In diesem Vortrag sollen zuerst spektrale Eigenschaften von
(deterministischen) Einteilchemodelle vorgestellt werden. Im
zweiten Teil des Vortrags werden Vielteilchensysteme eingeführt
und singuläre Zweiteilchen-Wechselwirkungen mittels selbstadjungierter
Erweiterungen geeigneter Lalaceoperatoren konstruiert. |
| Occasion: |
Seminar |
| Date: |
27. October 2010, 15.30 |
Joint Chemnitz-Zagreb Seminar on Mathematical Physics 5. -12. October 2010
(organised by Fabian Schwarzenberger, Martin Tautenhahn, and Ivan Veselić)
|
Ivan Veselić |
| Institution: |
TU Chemnitz |
Talk: |
Localised and delocalised states in quantum mechanical systems |
| Occasion: |
Joint Seminar |
| Date: |
11. October 2010, 15.00 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Luka Grubišić |
| Institution: |
University of Zagreb |
| Stay: |
5.-12. October 2010 |
Talk: |
Darstellungssätze für indefinite quadratische Formen mit Anwendungen in der Theorie der Operatorgleichungen |
| Occasion: |
Joint Seminar |
| Date: |
11. October 2010, 14.00 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Željko Kereta |
| Institution: |
University of Zagreb |
| Stay: |
5.-12. October 2010 |
Talk: |
An application of semigroup theory in initial boundary value problems |
| Occasion: |
Joint Seminar |
| Date: |
7. October 2010, 14.30 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Marko Erceg |
| Institution: |
University of Zagreb |
| Stay: |
5.-12. October 2010 |
Talk: |
Semigroups for flows in infinite networks |
| Occasion: |
Joint Seminar |
| Date: |
7. October 2010, 14.00 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Ivica Nakić |
| Institution: |
University of Zagreb |
| Stay: |
5.-12. October 2010 |
Talk: |
Fixing eigenvalues, pseudospectrum and distance problems in control theory |
| Occasion: |
Joint Seminar |
| Date: |
7. October 2010, 11.00 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Krešimir Veselić |
| Institution: |
Fernuniversität Hagen/ Sveučilište u Rijeci |
| Stay: |
5.-8. October 2010 |
Talk: |
Time evolution and spectra in quantum mechanics (3) |
| Occasion: |
Joint Seminar |
| Date: |
7. October 2010, 10.00 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Krešimir Veselić |
| Institution: |
Fernuniversität Hagen/ Sveučilište u Rijeci |
| Stay: |
5.-8. October 2010 |
Talk: |
Time evolution and spectra in quantum mechanics (2) |
| Occasion: |
Joint Seminar |
| Date: |
6. October 2010, 15.30 |
| Location: |
Seminar room 2/41/705 |
|
Daniel Wingert |
| Institution: |
TU Chemnitz |
| Talk: |
Heat kernel estimates for relativistic Schrödinger operators |
| Occasion: |
Joint Seminar |
| Date: |
6. October 2010, 14:45 |
| Location: |
Seminar room 2/41/705 |
|
Fabian Schwarzenberger |
| Institution: |
TU Chemnitz |
| Talk: |
Uniform approximation of the integrated density of states |
| Occasion: |
Joint Seminar |
| Date: |
6. October 2010, 14.00 |
| Location: |
Seminar room 2/41/705 |
|
Martin Tautenhahn |
| Institution: |
TU Chemnitz |
| Talk: |
Fractional moment method for discrete alloy-type models |
| Occasion: |
Joint Seminar |
| Date: |
6. October 2010, 11.00 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Krešimir Veselić |
| Institution: |
Fernuniversität Hagen/ Sveučilište u Rijeci |
| Stay: |
5.-8. October 2010 |
Talk: |
Time evolution and spectra in quantum mechanics (1) |
| Occasion: |
Joint Seminar |
| Date: |
6. October 2010, 10.00 |
| Location: |
Seminar room 2/41/705 |
| Visitor: |
Norbert Peyerimhoff |
| Institution: |
University of Durham |
| Stay: |
6.-11. July 2010 |
Talk: |
Spectral Representations of Archimedean Solids and finite Coxeter Groups |
| Occasion: |
Seminar |
| Date: |
9. July 2010, 15.30 |
| Visitor: |
Uta Freiberg |
| Institution: |
Universität Siegen |
| Stay: |
5.-7. July 2010 |
Talk: |
Dirichletformen auf zufälligen Sierpinski-Dreiecken |
| Occasion: |
Seminar |
| Date: |
7. July 2010, 15.30 |
| Visitor: |
Hendrik Vogt |
| Institution: |
TU Dresden |
| Talk: |
Stabilität von Wärmeleitungskern-Abschätzungen unter Potentialstörungen |
| Occasion: |
Chemnitzer Mathematisches Colloquium |
| Date: |
10. June 2010, 16.00 |
| Visitor: |
Matthias Keller |
| Institution: |
FSU Jena |
| Stay: |
9.-11. June 2010 |
Talk: |
Cheeger Constants, Exponential Growth and Spectrum of Planar Graphs |
Abstract: |
We will discuss relations between local geometry of innite planar graphs and global invariants. Namely we give estimates for Cheeger's constant (a.k.a. the isoperimetric constant) and exponential growth in terms of combinatorial curvature. These invariant |
| Occasion: |
Seminar |
| Date: |
9. June 2010, 15.30 |
| Visitor: |
Helge Krüger |
| Institution: |
Rice University, Texas, USA |
| Stay: |
25. - 28. May 2010 |
Talk: |
The application of Cartan's Lemma to Schroedinger Operators |
| Abstract: |
For an analytic function f, Cartan's Lemma bounds the measure of the set {z: |f(z)| < epsilon}. I will discuss how this can be used to obtain
estimates on the norm of the resolvent for Schroedinger operators, which
are an essential ingredient for multiscale analysis |
| Occasion: |
Analysis, Stochastics and Mathematical Physics seminar |
| Date: |
26. May 2010, 10.00 |
| Visitor: |
Karsten Leonhardt |
| Institution: |
Institut für Physik, TU Chemnitz |
| Talk: |
Der Weg zu offenen Quantensystemen |
| Occasion: |
Seminar |
| Date: |
25. May 2010, 15.30 |
| Visitor: |
Felix Pogorzelski |
| Institution: |
Universität Tübingen |
| Stay: |
18.-19. May 2010 |
Talk: |
Ergodic Theorems on Amenable Groups |
| Occasion: |
Seminar |
| Date: |
19. May 2010, 15.30 |
| Visitor: |
Frank Göring |
| Institution: |
Professur Algorithmische und Diskrete Mathematik, Fakultät für Mathematik, TU Chemnitz |
| Talk: |
Unabhängige Mengen in Graphen großer Taillenweite |
Abstract: |
Vortrag von Frank Göring zu einer Anwendung "Der probabilistischen Methode" auf Graphen |
| Occasion: |
Seminar |
| Date: |
12. May 2010, 15.30 |
| Visitor: |
Markus Fidler |
| Institution: |
Institute of Communications Technology, Leibniz Universität Hannover |
| Talk: |
Stochastic Network Calculus: Assessing the Performance of the Future Internet |
Abstract: |
The further development of today's Internet is significantly hampered by a lack of understanding. The exact knowledge of a technology, on the other hand, can accelerate progress and yield sustained innovations. To this end, queuing theory has be. |
| Occasion: |
Chemnitzer Mathematisches Colloquium |
| Date: |
22. April 2010, 16.00 |
