n-cities-seminar

The n-cities seminar is organized by mathematicians from the Universities of Chemnitz, Dresden, Freiberg and Leipzig (currently Swanhild Bernstein, Ralph Chill, Thomas Kalmes, Felix Otto, Felix Pogorzelski, Tatjana Eisner, Nils Waterstraat, and Marcus Waurick) and is dedicated to the following fields of interest.

fields of interest:

Functional analysis
Analysis of partial differential equations
Complex analysis
Operator theory
Theory of operator semigroups
Probability and ergodic theory

Program of upcoming event

17 January 2025 in Chemnitz

Programme of previous events

3 May 2024 in Leipzig (MPI)

12:45: J. Miehe (TU Chemnitz)
Fermionic integration and perturbations of semigroups
13:30: C. Raithel (TU Dresden)
Density fluctuations in weakly interacting particle systems via the Dean-Kawasaki equation
14:15: M. Porfido (TU Bergakademie Freiberg)
Kernel estimates for a class of fractional Kolmogorov operators
15:00: Coffee break
15:30: N. Doll (Martin-Luther-University Halle-Wittenberg)
Orientation flow for real skew-adjoint Fredholm operators with odd-dimensional kernel
16:15: J. Hirsch (U Leipzig)
On the Lawson-Osserman conjecture on the minimal surfaces system
17:00: P. Morfe (MPI MiS Leipzig)
Minimal Lipschitz Extensions and the Finsler Infinity Laplacian

12 January 2024 in Dresden

13:00: M. Waurick (TU Bergakademie Freiberg)
A Hilbert space approach to state-dependent delay equations
13:45: D. Pauly (TU Dresden)
Traces for Hilbert complexes
14:30: B. Güneysu (TU Chemnitz)
Locally integrable subharmonic functions on local Dirichlet spaces
approx. 15:15: Coffee break (Room WIL C 218)
15:45: T. Dohnal (U Halle-Wittenberg)
Wavepackets and standing waves at a material interface in nonlinear Maxwell equations
16:30: J. Sauer (U Jena)
Optimal Sobolev regularity for degenerate equations of porous media type

14 July 2023 in Halle

13:00: M. Wilke (U Halle)
Fluid flows on surfaces
13:45: M. Müller (U Leipzig)
The biharmonic Alt-Caffarelli problem
14:30: E. Döhrer (TU Chemnitz)
On a complete Riemannian metric on the space of embedded W^s,2-curves
approx. 15:15: Coffee break
15:45: A. Buchinger (TU Bergakademie Freiberg)
On some Impedance Boundary Conditions for a Thermo-Piezo-Electromagnetic System
16:30: R. Chill (TU Dresden)
Nonlinear nonlocal elliptic operators

16 December 2022 in Freiberg

13:00: Christian Seifert (TU Hamburg-Harburg)
Some Results on Control Systems in Banach spaces
13:35: Sahiba Ahora (TU Dresden)
A tour of eventual positivity
14:10: Raj Dahya (U Leipzig)
Approximations and dilations of commuting families of C0-semigroups
14:45: Coffee break
15:30: Shayan Alikhanloo (TU Chemnitz)
Self-adjoint Laplacians and symmetric diffusions on hyperbolic attractors
16:05: Mathias Schäffner (U Halle)
Regularity for non-uniformly elliptic equations
16:40: Lukas Koch (MPI Leipzig)
Non-occurrence of global Lavrentiev for vectorial functionals with (p,q)-growth

1 July 2022 in Chemnitz

13:00: Nils Waterstraat (Uni Halle-Wittenberg)
The G-equivariant Spectral Flow and Bifurcation of Functionals with Symmetries
13:40: Marcel Schmidt (Uni Leipzig)
Weak Hardy/Poincaré inequalities and criticality theory
14:50: Nathanael Skrepek (TU Bergakademie Freiberg)
Semi-uniform stability of Maxwells equations via a boundary feedback
15:20: Henrik Schumacher (TU Chemnitz)
Repulsive curves and surfaces
16:40: Tobias Ried (MPI Leipzig)
Cwikel’s bound reloaded
17:20: Mahamadi Warma (George Mason University, USA)
Turnpike properties for fractional control problems

26 April 2019 in Freiberg

13:30 - 14:00 Uhr: A. Szkola (Leipzig)
"On the problem of testing composite hypotheses in non-commutative statistical models"
14:05 - 14:35 Uhr: B. Claus (Dresden)
"Nonlinear Dirichlet forms"
15:40 - 16:10 Uhr: D. Lorenz (Freiberg)
"Linear hyperbolic Cauchy problems with low-regular coefficients"
16:15 - 16:45 Uhr: C. Bombach (Chemnitz)
"Unique determination of a rough potential from boundary data"
16:50 - 17:20 Uhr: W. Chen (Freiberg)
"Elastic waves with different damping mechanisms"

2 November 2018 in Leipzig

14:00 - 14:45 Uhr: Lars Perlich (Dresden)
"Dirichlet-to-Robin operators via composition semigroups"
14:45 - 15:30 Uhr: Michael Wutzig (Freiberg)
"Reproducing kernels in harmonic and Clifford analysis"
16:00 - 16:45 Uhr: Jan-Frederik Pietschmann (Chemnitz)
"Some remarks on a cross-diffusion equations with size exclusion"
16:45 - 17:30 Uhr: Florentin Münch (Leipzig)
"Liouville property and discrete Ricci curvature"

29 June 2018 in Dresden

13:45 - 14:30 Uhr: Jan-David Hardtke (Leipzig)
"Octahedral and almost square Banach spaces"
14:30 - 15:15 Uhr: Martin Himmel (Freiberg)
"New classes of means related to the Cauchy functional equations and their properties"
16:00 - 16:45 Uhr: Martin Tautenhahn (Chemnitz)
"Null controllability and control costs for the heat equation in unbounded domains"
16:45 - 17:30 Uhr: Wolfgang Arendt (Ulm)
"Evolution on spaces of continuous functions / Evolution auf Räumen von stetigen Funktionen"

19 January 2018 in Chemnitz

14:00 - 14:45 Uhr: Sebastian Mildner (Dresden)
"Symmetry between the energy of a gradient system and its Lyapunov functions"
14:45 - 15:30 Uhr: Christian Seifert (Hamburg)
"Operators via Boundary Systems"
16:00 - 16:45 Uhr: Tatjana Eisner (Leipzig)
"Wiener‘s lemma along primes"
16:45 - 17:30 Uhr: David Damanik (Houston)
"Localization for the one-dimensional Anderson model via positivity and large deviations for the Lyapunov exponent"

23 June 2017 in Freiberg

14:00 - 1445 Uhr: Therese Mieth (Leipzig)
"Entropy and approximation numbers of Sobolev embeddings"
14:45 - 15:30 Uhr: Christian Rose (Chemnitz)
"Heat kernel estimates based on Ricci curvature integral bounds"
16:00 - 16:45 Uhr: Lena Malinowski (Dresden)
"Operators in pre-Riesz-spaces"
16:45 - 17:30 Uhr: Maximilian Reich (Freiberg)
"Composition in Weighted Modulation Spaces and Applications to
Nonlinear PDEs"

4 November 2016 in Leipzig

13:30 - 14:20 Uhr: Markus Hartlapp (Dresden)
"A quantified version of Ingham's original Tauberian theorem"
15:30 - 16:30 Uhr: Abdelaziz Rhandi (Salerno)
"Functional analytic methods for stochastic differential operators"
16:30 - 17:30 Uhr: Marcel Hansmann (Chemnitz)
"On the distribution of eigenvalues of compactly perturbed operators"

29 April 2016 in Dresden

13:30 - 14:20 Uhr: Mario Helm (Freiberg)
"Numerische Aspekte der Auswertung der Frechet-Ableitung von Matrix-Exponential-Funktionen"
14:30 - 15:20 Uhr: Jürgen Voigt (Dresden)
"Bands in L^p-spaces"
15:50 - 16:40 Uhr: Thomas Kühn (Leipzig)
"Optimal approximation of multivariate periodic functions"
16:50 - 17:40 Uhr: Michela Egidi (Chemnitz)
"Quantitative uncertainty principle on the torus"

30 October 2015 in Chemnitz

14:00 - 14:50 Uhr: Andras Batkai (Wuppertal)
"Approximationen von Evolutionsfamilien"
15:00 - 15:50 Uhr: Oliver Rheinbach (Freiberg)
"Parallele nichtlineare Gebietszerlegungsverfahren in der Strukturmechanik"
16:30 - 17:20 Uhr: Sascha Trostorff (TU Dresden)
"Über eine Klasse maximal monotoner Block-Operator-Matrizen in evolutionären Gleichungen"

6 February 2015 in Leipzig

13:30 - 14:20 Uhr: Swanhild Bernstein (Freiberg) tba
14:30 - 15:20 Uhr: Anke Kalauch (Dresden)
"Ideale und Bänder in prä-Riesz-Räumen"
15:50 - 16:40 Uhr: Dirk Werner (Berlin)
"Banachräume mit der Daugavet-Eigenschaft"
16:50 - 17:40 Uhr: Daniel Potts (Chemnitz)
"High dimensional approximation with trigonometric polynomials"

14 October 2014 in Dresden

13:30 - 14:15 Uhr: Fabian Schwarzenberger (Leipzig)
"The integrated density of states on coloured graphs"
14:30 - 15:15 Uhr: Martin Tautenhahn (Chemnitz)
"Quantitative unique continuation and Wegner estimate for random Schrödinger operators"
16:15- 17:00 Uhr: Yuri Tomilov (Warschau, IMPAN)
"From prime numbers to damped waves"

9 May 2014 in Chemnitz:

13:00 - 13:45 Uhr: Konrad Schmüdgen (Leipzig)
"Schrödingeroperatoren mit unendlich vielen Punktwechselwirkungen"
14:00 - 14:45 Uhr: Thomas Kalmes (Chemnitz)
"Eine Vermutung von Treves und ihre Verallgemeinerung auf Ultradistributionen"
16:00 - 16:45 Uhr: Sebastian Krol (Dresden / Torun)
"Fourier multipliers on weighted L^p spaces"

31 January 2014 in Leipzig:

15:00 - 15:45 Uhr: Peter Stollmann (Chemnitz)
"The Complex Laplacian and its Heat Semigroup"
16:15 - 17:00 Uhr: Marcus Waurick (Dresden)
"Über nicht-autonome, degenerierte Gleichungen"
17:05 - 17:50 Uhr: Felix Pogorzelski (Jena)
"Convergence of discrete geometries and spectral approximation"

(see also here )