[Vortraege] Vortragsankündigungen KW. 24

[Danijela Radosavljevic]

Sehr geehrte Fakultätsmitglieder,

anbei die Vortragsankündigungen für die kommende Woche, im Anhang finden 
Sie den Text auch als PDF Datei.

Mit freundlichen Grüßen

Danijela Radosavljevic

Sekretariat
Institut für Mathematik
Universität Wien
Nordbergstr. 15, UZA 4
Tel: 43 1 4277 50629
Fax: 43 1 4277 9506

*Vorträge*

**

*Mittwoch, 15. Juni 2011, ab 16:15 Uhr, Olga Taussky-Todd Raum (C 209), 
UZA 4*

*Mathematisches Kolloquium*

*Univ.-Prof. Dr. Klaus Schmidt: “Entropy and periodic points of 
algebraic actions of discrete amenable groups”*

**

*(15:45 Uhr bis 16:15 Uhr: K & K im Common Room)*

*__*

Abstract:If G is a discrete amenable group, every element f in the integral group ring ZG defines a measure-preserving action alpha_f of G by automorphisms of a compact abelian group X_f. This action is automatically ergodic whenever G is not essentially equal to the group of integers.

The entropy of this 'algebraic' action alpha_f is an interesting 
quantity associated with the element f in ZG. If G=Z^d, then it is the 
logarithmic Mahler measure of f (viewed as a Laurent polynomial in d 
variables with integer coefficients).

If G is residually finite and the action alpha_f is expansive, it is the 
logarithmic growth rate of the number of periodic points of alpha_f, 
which in turn coincides with the logarithm of the Fuglede-Kadison 
determinant associated with f (viewed as an element of the group von 
Neumann algebra of G).

If alpha_f is nonexpansive, the connection between entropy, the 
logarithmic growth rate of periodic points, and Fuglede-Kadison 
determinants holds many mysteries, even for G=Z^d. Some of these 
problems will be discussed in this lecture.

This talk is based on joint work with C. Deninger, D. Lind and E. 
Verbitskiy.

__

*Dekan Univ.-Prof. Dr. Harald Rindler,**V.-Prof. Mag. Dr. Herwig Hauser *

**

*Dienstag, 14. Juni 2011, TU, Institut für Informationssysteme, 
Favoritenstraße 9, Seminarraum von Neumann, (Erdgeschoss)*

*WPI Vortrag*

*14:00 Uhr: **“Koivisto Mikko: Exponential-time algorithms for Bayesian 
networks”*

*15:00 Uhr:**“Liedloff Mathieu: “A Fast Exact Algorithm for 
L(2,1)-Labeling of Graphs”*

*Link: **http://www.wpi.ac.at/talks_view.php***

**

*Freitag, 17. Juni 2011, Freihaus, grüner Turm (A), 5. Stock, kleiner 
Seminarraum 104, Wiedner Hauptstraße 8-10, 1040 Wien*

*Algebra Seminar (**Im Rahmen der Lehrveranstaltung "Seminar mit Seminararbeit")*

*  *

*12:00 Uhr: **Victoria Fiedler: Partitionsverbände*

*13:00 Uhr: **Andreas Fellner: Fraktale Verbände*

*Link: **http://www.dmg.tuwien.ac.at/fg1/seminar.html***

**

*Donnerstag, 16. Juni 2011, von 12:00 Uhr bis 13:00 Uhr. **Seminarraum 
2A 310, UZA 2*

*Algebra-Kolloquium*

*J.S. Wilson: „Hereditarily just infinite groups“*

*Link:**http://plone.mat.univie.ac.at/vortrage/ak***

**

*Freitag, 17. Juni, 2011, von 14:00 Uhr bis 16:00 Uhr, Leopols 
Schmetterer Seminarraum des Instituts für Statistik und OR, 3. Stock 
Universitätsstraße 5, 1010 Wien *

*Berufungsvorträge Mathematics and Finance *

*Joachim Grammig: “Creative Destruction and Asset Prices”*

*(Details siehe Attachment)*

**



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