# Gjesteforelesninger, seminarer og konferanser

## Kommende

Tid og sted: 20. apr. 2015 - 24. apr. 2015,

Welcome to the SECOND conference on Stochastics of Environmental and Financial Economics. The conference will bring together leading researchers in the fields of stochastic analysis and finance to discuss recent developments and challenges with an edge towards energy, environmental and financial markets.

The conference is also a celebration of professor Bernt Øksendal's 70th anniversary. On Thursday April 23 the program of the conference will mark this big event with a selected list of speakers.

The conference is organized by the Center of Advanced Studies (CAS), Stochastics of Environmental and Financial Economics. Scientific organizers: Fred Espen Benth and Giulia Di Nunno (UiO)

Tid og sted: 21. mai. 2015 - 22. mai. 2015,
Tid og sted: 23. mai. 2015 - 24. mai. 2015,

Fourteenth International Workshop

Tid og sted: 29. mai. 2015 - 30. mai. 2015,

The statistics groups at the University of Oslo and the Norwegian University of Life Sciences invite all PhD-students and postdocs within statistics in the OIslo-region as well as their teachers and supervisors to a  2-days workshop.

Tid og sted: 7. aug. 2015 20:00 - 11. aug. 2015 06:45, Coastal Express (Hurtigruten), Norway

Please note that participation is by invitation only. Note also that there is an official homepage of the Abel Symposium 2015.

## Tidligere

Tid og sted: 16. apr. 2015 14:15 - 16:00, B62, NH Abels hus

Kristian Ranestad, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Modular curves VI

Tid og sted: 15. apr. 2015 14:15 - 15:15, NHA B735

Réamonn Ó Buachalla (IMPAN) will give a talk with title: Noncommutative Kähler structures on quantum homogeneous spaces

Abstract:

Building on the definition of a noncommutative complex structure for a general algebra A, I will introduce the notion of a noncommutative Kähler structure for A. In the special case where A is a quantum homogeneous space, I show that many of the fundamental results of classical Kähler geometry follow from the existence of such a structure: Hodge decomposition, Serre duality, the Hard Lefschetz theorem, the Kähler identities, and collapse of the Frölicher spectral sequence at the first page. We then apply these results to Heckenberger and Kolb's differential calculus for quantum projective space, and show that they have cohomology groups of at least classical dimension. Time permitting, I will also discuss the relationship of this work to Connes proposal to study positive Hochschild cocycles as a starting point for noncommutative complex geometry, and Fröchlich, Grandjean, and Recknagel's definition of a Kähler spectral tuple.

Tid og sted: 13. apr. 2015 12:15 - 14:00, NHA B735

Eduard Ortega, NTNU, will give a talk with title: Cuntz-Krieger uniqueness theorems

Abstract: I will make a little survey about Cuntz-Krieger uniqueness theorems and how they help to the study of the ideal structure of the rings to which one can apply them. In certain classes of (C*-)algebras this is described as topologically freeness or condition (L). However they are important classes of rings for which are not known Cuntz-Krieger type theorems. I will present a class of rings, that generalize Leavitt path algebras and Passman crossed products, for which I can totally characterize the Cuntz-Krieger uniqueness theorem.

Tid og sted: 10. apr. 2015 10:15 - 11:15, NHA B1036

Parameter-robust finite element discretization and its preconditioning for Biot's consolidation model in poroelasticity

Tid og sted: 10. apr. 2015 - 11. apr. 2015,
Tid og sted: 8. apr. 2015 14:15 - 15:00, NHA B735

Erik Bédos will give a talk with title: On the Fourier-Stieltjes algebra of a C*-dynamical system

Abstract: When G is a discrete group, its Fourier-Stieltjes algebra B(G) may be described as the set of coefficient functions associated with unitary representations of G on Hilbert spaces. In a similar way, if Sigma=(A, G, alpha, sigma) is a unital discrete twisted C*-dynamical system, one may let the Fourier-Stieltjes algebra B(Sigma) consist of the functions from G x A into A that arise as coefficient functions of equivariant representations of Sigma on Hilbert A-modules. We will explain how B(Sigma) may be organized as an algebra with conjugation, and show that it may be represented as completely bounded multipliers on the full crossed product C*(Sigma). (This is also known to be true for the reduced crossed product). This is part of an ongoing project with Roberto Conti (Rome).

Tid og sted: 26. mar. 2015 14:15 - 16:00, B62, NH Abels hus

Arvid Siqveland, Høgskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:

Modular curves V

Tid og sted: 25. mar. 2015 14:15 - 23. mar. 2015 16:00, VB, Auditorium 2

These are the fifth and and the sixth lectures given by Anders Hansen (Cambridge Univ. and UiO) on Compressed sensing - Theory and Applications.

Tid og sted: 25. mar. 2015 13:00 - 15:00, "bikuben" - Kristine Bonnevies hus
Tid og sted: 24. mar. 2015 12:15 - 23. mar. 2015 14:00, VB, Auditorium 2

These are the third and fourth lectures given by Anders Hansen (Cambridge Univ. and UiO) on Compressed sensing - Theory and Applications.

Tid og sted: 23. mar. 2015 12:15 - 14:00, VB, Auditorium 2
These are the first two of six 45-min. lectures given by Anders Hansen (Cambridge Univ. and UiO) on Compressed sensing - Theory and Applications.
Tid og sted: 19. mar. 2015 14:15 - 16:00, B62, NH Abels hus

Fredrik Meyer, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Modular curves IV

Tid: 17. mar. 2015 14:15

Olav Breivik (Dept. of Math., UiO ) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 March 17th:  Bycatch of juvenile cod in the Barents Sea shrimp fishery

Tid og sted: 12. mar. 2015 14:15 - 16:00, B62, NH Abels hus

Arne B. Sletsjøe, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Modular curves III

Tid og sted: 12. mar. 2015 10:15 - 12:00, Ole Johan Dahls hus, møterommet i etasje 9

Sam Sanders, Ghent and Munich, will give a lecture with the tittle

On the contingency of predicativism.

Tid og sted: 11. mar. 2015 14:15 - 16:00, NHA B71

Franz Luef (NTNU) will give  a talk with title "Sigma-models solitons on noncommutative spaces"

Abstract: Results from time-frequency analysis and Gabor analysis allow the construction of new classes of sigma-model solitons over the Moyal plane and over noncommutative tori, taken as source spaces, with a target space made of two points. A natural action functional leads to self-duality equations for projections in the source algebra. Solutions, having non-trivial topological content, are constructed via suitable Morita duality bimodules. This is joint work with L. Dabrowski and G. Landi.

Tid: 10. mar. 2015 14:15

John Dagsvik ( Statistics Norway ) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 March 10th:  How Does the Temperature Vary over Time?  Evidence on the Stationary and Fractal  Nature of Temperature Fluctuations

Tid og sted: 5. mar. 2015 14:15 - 16:00, B62, NH Abels hus

Johannes Kleppe, Høskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:

Modular curves II

Tid og sted: 4. mar. 2015 14:15 - 16:00, NHA B735

Bartosz K. Kwaśniewski (University of Southern Denmark, Odense) will talk on: Topological aperiodicity for product systems of C*-correspondences

Abstract:We introduce a semigroup of multivalued maps dual to a product system of $C^*$-correspondences over an Ore semigroup. Under a certain aperiodicity condition on the dual semigroup we obtain a uniqueness theorem and a simplicity criterion for the associated Cuntz-Pimsner algebra. These results generalize similar statements for crossed products by groups (R. J. Archbold, J. S. Spielberg) and Exel’s crossed products (R. Exel, A. Vershik). They also give interesting conditions for topological higher rank graphs, and apply to the new Cuntz $C^*$-algebra $\mathcal{Q}_\mathbb{N}$ arising from the `$ax+b$'-semigroup over natural numbers. (Based on joint work with Wojciech Szymański.)

Tid og sted: 26. feb. 2015 14:15 - 16:00, B62, NH Abels hus

Geir Ellingsrud, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Modular curves I

Abonner
Abonner Lukk