Faculty of Mathematics


n-Städte Seminar - n-Cities seminar

The n cities seminar is organized by mathematicians from the Universities of Chemnitz, Dresden, Freiberg, Halle and Leipzig, as well as the Max Planck Institute for Mathematics in the Sciences (MiS) in Leipzig (currently Ralph Chill, Thomas Kalmes, Felix Otto, Felix Pogorzelski, Nils Waterstraat and Marcus Waurick) and is dedicated, but not restricted to, a variety of fields in a neighborhood of analysis, amongst them:

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

If you are interested in information concerning these regular meetings, please subscribe to this mailing list. Of course, as an organizer you are invited to also share information through this mailing list.

Forthcoming and previous events

Venue: TU Chemnitz, central lecture hall building (Zentrales Hörsaalgebäude), seminar room C10.111, Reichenhainer Strasse 90, 09126 Chemnitz
Schedule:
  • 13:00 Stefan Czimek (U Leipzig)
    Introduction to the Null Gluing Problem in General Relativity
  • 13:45 Lucas Broux (MPI MiS Leipzig)
    Renormalization
  • 14:30 Stephan Mescher (U Halle-Wittenberg)
    Lusternik-Schnirelmann theory and topological complexity
  • 15:15 Coffee break
  • 15:45 Janko Stennder (TU Dresden)
    Markov operators and Riesz* homomorphisms on order unit spaces
  • 16:30 Martha Zimmermann
    Different Approaches to q-deformed Clifford Analysis
  • 17:15 Dalimil Peša (TU Chemnitz)
    Rearrangement-invariant quasi-Banach function spaces and their amalgams
  • 18:45 Dinner (Restaurant to be announced; based on self payment; please, give some feedback on your intention to join, at the latest by January 5, 2025, here)

Venue: Max Planck Institute for Mathematics in the Sciences (E1 05 Leibniz lecture hall), Inselstraße 22, 04103 Leipzig
Schedule:
  • 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
  • 18:30: Dinner at Barthels Hof
Download the poster of the seminar

Venue: TU Dresden, Faculty of Mathematics (Willers-Bau, C-Flügel, ground floor, Room C 129), Zellescher Weg 12-14, 01069 Dresden
Schedule:
  • 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
  • Following up at approx. 18:00:
    After session at Restaurant "Sindbad", Hübnerstraße 13, 01069 Dresden

Venue: Lecture hall 1.04, Building VSP 1, Von-Seckendorf-Platz 1, 06120 Halle
Schedule:
  • 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 Ws,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
  • Following up:
    Barbecue by the student representatives at the Geological Garden, located nearby the venue; NO registration required

Venue: SPQ-0302, Schlossplatzquartier, Prüferstraße 4 (or https://bbb.hrz.tu-freiberg.de/b/and-hos-zgl-fee)
Schedule: Abstracts
  • 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
  • 17:30: Dinner
    “Schwanenschlößchen zu Freiberg” at Meißner Ring 33

Venue: Room N113, Central Lecture Hall (Zentrales Hörsaalgebäude), Reichenhainer Str. 90
Schedule:
  • 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

Venue: Max-Planck-Istitut für Mathematik in den Naturwissenschaften
Schedule:
  • 14:00: Uta Freiberg (TU Chemnitz)
    Dirichlet forms on quantum graphs with vanishing edge lengths
  • 14:40: Sebastian Boldt (Uni Leipzig)
    Scattering Theory of the Dirac operator
  • 15:35: Leonid Chaichenets (TU Dresden))
    On the global wellposedness of the Klein-Gordon equation for initial data in modulation spaces
  • 16:15: Halit Sevki Aslan (TU Bergakademie Freiberg)
    Liouville property and discrete Ricci curvatur
  • 16:55: María Ángeles García-Ferrero (MPI Leipzig)
    Runge approximation properties for local and non-local operators

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

Venue: Uni Leipzig, Augustusplatz 10, Felix-Klein-Hörsaal (P501)
Schedule:
  • 14:00-14:45: Lars Perlich (Dresden)
    Dirichlet-to-Robin operators via composition
  • 14:45-15:30: Michael Wutzig (Freiberg)
    Reproducing kernels in harmonic and Clifford analysis
  • 16:00-16:45: Jan-Frederik Pietschmann (Chemnitz)
    Some remarks on a cross-diffusion equation with size exclusion
  • 16:45-17:30: Florentin Münch (Leipzig)
    Liouville property and discrete Ricci curvature
Flyer: .pdf

Venue: TU Dresden, Willersbau WIL C207
Schedule:
  • 13:45-14:30: Jan-David Hardtke (Leipzig)
    Octahedral and almost square Banach spaces
  • 14:30-15:15: Martin Himmel (Freiberg)
    New classes of means related to the Cauchy functional equations and their properties
  • 16:00-16:45: Martin Tautenhahn (Chemnitz) (Leipzig)
    Null controllability and control costs for the heat equation in unbounded domains
  • 16:45-17:30: Wolfgang Arendt (Ulm)
    Evolution on spaces of continuous functions / Evolution auf Räumen von stetigen Funktionen

Venue: Room B202, Reichenhainer Str. 70, Rühlmann-Bau.
Schedule:
  • 14:00-14:45: Sebastian Mildner (Dresden)
    Symmetry between the energy of a gradient system and its Lyapunov functions
  • 14:45-15:30: Christian Seifert (Hamburg)
    Operators via Boundary Systems
  • 16:00-16:45: Tatjana Eisner (Leipzig)
    Wiener‘s lemma along primes
  • 16:45-17:30: David Damanik (Houston)
    Localization for the one-dimensional Anderson model via positivity and large deviations for the Lyapunov exponent
  • 18:30: Joint Dinner at the Turm Brauhaus

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

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

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

Venue: Room B202, Reichenhainer Str. 70, Rühlmann-Bau.
Schedule:
  • 14:00-14:50: Andras Batkai (Wuppertal)
    Approximationen von Evolutionsfamilien
  • 15:00-15:50: Oliver Rheinbach (TU Freiberg)
    Parallel Nonlinear Domain Decomposition Methods in Structural Mechanics
  • 16:00-16:30: Coffee break
  • 16:30-17:20: Sascha Trostorff (TU Dresden)
    Über eine Klasse maximal monotoner Block-Operator-Matrizen in evolutionären Gleichungen.
  • 18:00: Joint dinner

Local Organisers and support: Anne Glanzberg and Matthias Täufer

Venue: Rooms P801 and P501, Augustusplatz 10, Paulinum.
Schedule:
  • 13:30-14:20: Swanhild Bernstein (Freiberg)
    Wavelets on Lie groups and homogeneous spaces
  • 14:30-15:20: Anke Kalauch (Dresden)
    Ideale und Bänder in prä-Riesz-Räumen (slides)
  • 15:50-16:40: Dirk Werner (Berlin)
    Banachräume mit der Daugavet-Eigenschaft (slides)
  • 16:50-17:40: Daniel Potts (Chemnitz)
    High dimensional approximation with trigonometric polynomials (slides)
Flyer: .pdf

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

Venue: Room B202, Reichenhainer Str. 70, Rühlmann-Bau.
Schedule:
  • 13:00-13:45: Konrad Schmüdgen (Leipzig))
    Schrödingeroperatoren  mit unendlich vielen Punktwechselwirkungen (abstract)
  • 14:00-14:45: Thomas Kalmes (Chemnitz))
    Eine Vermutung von Treves und ihre Verallgemeinerung auf Ultradistributionen (abstract)
  • 15:00-16:00 Coffee break
  • 16:00-16:45 Sebastian Krol (Leipzig)
    Fourier multipliers on weighted \(L^p\) spaces
Flyer: .pdf

Leipzig, 31.1.2014

Venue: Room HS 17, Augustplatz 10, Hörsaalgebäude
Schedule:
  • 15:00-15:45: Peter Stollmann (Chemnitz)
    The Complex Laplacian and its Heat Semigroup
  • 15:45-16:15: Coffee break
  • 16:15-17:00: Marcus Waurick (Dresden)
    Über nicht-autonome, degenerierte Gleichungen
  • 17:05-17:50: Felix Pogorzelski (Jena)
    Convergence of discrete geometries and spectral approximation
Flyer: .pdf