Vorträge in der Woche 13.11.2017 bis 19.11.2017

Donnerstag, 16.11.2017: Fasermultiplikatoren und Zerlegungen

Retha Heymann (Stellenbosch)

Multiplikatoren auf vektorwertigen Funktionenräumen werden definiert und ein Zerlegungssatz wird besprochen. Dann wird das allgemeinere Setting betrachtet, wobei Fasermultiplikatoren eingeführt werden. Dazu betrachtet man den entsprechenden Faserzerlegungssatz.

Donnerstag, 16.11.2017: Classification of nodal sextics in the real projective plane

Johannes Josi (Universität Genf)

I will explain how one can use periods of K3 surfaces and the classification of involutions on lattices to classify nodal curves of degree six in the real projective plane up to rigid isotopies, that is, deformations in the space of algebraic curves of the same degree and with the same singularities. This classification was obtained by V. Nikulin in 1979 for the case of non-singular sextics, and extended to the case of sextics with one node by I. Itenberg in 1991. I will start by explaining Nikulin's proof and then show how it can be adapted to cover the case of sextics with several nodes.

Freitag, 17.11.2017: On the dynamics of non-commutative quasicrystals

Felix Pogorzelski (Leipzig)

Freitag, 17.11.2017: On the simple Lebesgue spectrum problem of Banach in ergodic theory, flat polynomials and related topics

El Houcein El Abdalaoui (Rouen)

Freitag, 17.11.2017: On equidistribution of two-dimensional planes in four space and refinements

Andreas Wieser (Zürich)

Freitag, 17.11.2017: On equidistribution of primitive rational points along expanding horospheres

Manuel Luethi (Zürich)

Freitag, 17.11.2017: Jump inequalities via real interpolation

Pavel Zorin-Kranich (Bonn)

Freitag, 17.11.2017: Limits of proper G-spaces

Jean Renault (Orléans)

Freitag, 17.11.2017: Connections between Nörlund matrices and ergodic theory.

Christophe Cuny (Brest)

Freitag, 17.11.2017: Weak model sets and dynamical systems of number-theoretic origin

Michael Baake, Bielefeld

Square-free integers, visible lattice points and their generalisations give rise to dynamical systems with interesting spectral properties. Many of them have recently found a systematic description in terms of weak model sets. Under a mild extra condition, the latter display pure point spectrum, both in the diffraction and the dynamical sense. This talk will introduce some of the concepts and results (based on joint work with Robert Moody, Peter Pleasants, Christian Huck and Nicolae Strungaru). Vortrag im Rahmen des Workshops "Operator Theoretic Aspects of Ergodic Theory"

Samstag, 18.11.2017: Weak-star ergodic problems and enveloping semigroups

Alexander Romanov (Moscow)

Samstag, 18.11.2017: Spectral disjointness of powers of smooth diffeomorphisms

Philipp Kunde (Hamburg)

Samstag, 18.11.2017: Mean ergodicity versus weak almost periodicity of positive operators

Jochen Glück (Ulm)

Samstag, 18.11.2017: About the differentiability of strongly continuous representations of R_+

Marco Peruzzetto (Kiel)

Samstag, 18.11.2017: Weighted ergodic theorems in Banach spaces

Tanja Eisner (Leipzig)