Events - Page 20

Time and place: Sep. 23, 2014 3:15 PM - 4:00 PM, B1036, 10th floor, NHA

Variational integrators for interconnected Lagrange-Dirac dynamical systems

Time: Sep. 23, 2014 2:15 PM

Ørnulf Borgan (Department of Mathematics,UiO) gives a seminar

in room 107, 1st floor N.H. Abels House at 14:15 Tuesday September 23rd:

Using cumulative sums of martingale residuals for model checking in nested case-control studies  

Time and place: Sep. 18, 2014 2:15 PM - 4:00 PM, B62, NH Abels hus

Andrea Hofmann, Høgskolen i Østfold, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties IV

Time: Sep. 17, 2014 2:00 PM - 4:00 PM

Abstract: We show that the discrete duals of the so called free orthogonal quantum groups have the completely contractive approximation property, analogous to the free groups. The proof relies on the structure of representation categories of these quantum groups, on the C*-algebraic structure of SUq(2), and on the free product techniques of Ricard and Xu. This talk is based on joint work with Kenny De Commer and Amaury Freslon.

Time and place: Sep. 15, 2014 - Sep. 19, 2014, The Norwegian Academy of Sciences and Letters

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

Time and place: Sep. 11, 2014 2:15 PM - 4:00 PM, B62, NH Abels hus

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

Abelian varieties III

Time and place: Sep. 10, 2014 3:15 PM - 4:15 PM, B71, NHA

Abstract: Independence has been introduced as a regularity property for pairs of commuting injective group endomorphisms of a discrete abelian group with finite cokernel by Joachim Cuntz and Anatoly Vershik. We discuss various characterisations of this regularity property and show how the statements need to be adjusted when removing the restrictions that the group has to be abelian and that the cokernels have to be finite. Somewhat surprisingly, this leads to the concept of *-commutativity. This property is defined for pairs of commuting self-maps of an arbitrary set. As an examples of *-commutativity, we explain a construction related to the Ledrappier shift and indicate how one obtains examples for independent group endomorphisms from this construction. If time permits, we will point out instances where the two notions have been readily used to obtain C*-algebraic results. Roughly speaking, both notions are designed to give rise to pairs of doubly commuting isometries, which significantly simplifies the analysis of the constructed C*-algebras. This is particularly useful when one tries to generalise results from the case of a single transformation to an action generated by finitely many transformations.

Time and place: Sep. 4, 2014 2:15 PM - 4:00 PM, B62, NH Abels hus

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

Abelian varieties II

Time and place: Aug. 29, 2014 10:15 AM - 11:00 AM, B1036, NHA

Parabolic optimal control problems with pointwise controls

Time and place: Aug. 28, 2014 2:15 PM - 4:00 PM, B62, NH Abels hus

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

Abelian varieties I

Time and place: Aug. 22, 2014 2:30 PM - 3:30 PM, Pauseareal 7.etg. NHA

Abstract: I wish to give some insight into how a generalization of a question related to the limiting behaviour of sequences of large graphs allows for a fruitful interaction between ideas and methods from combinatorics, probability theory and functional analysis. Joint work with L. Lovász and B. Szegedy.

Time and place: Aug. 21, 2014 10:15 AM - 12:00 PM, B 63

The logic seminar will take place in B63 in NHA on Thursdays from 10.15 to 12.00.

The program is tentative. There are free slots in the program. Contact Dag Normann for suggestions or questions.

Time and place: Aug. 5, 2014 11:00 AM - 12:00 PM, B91 Abel Building

Three-dimensional instability of solitary water waves

 

Time and place: June 18, 2014 2:15 PM - 3:00 PM, B1036

Jocelyne Bion-Nadal (CNRS and Ecole Polytechnique) holder et seminar med tittelen: Martingale problem for integro-differential operators with path dependent coefficients

Time: June 17, 2014 2:15 PM

Per A. Mykland (The University of Chicago) og Lan Zhang (University of Illinois at Chicago) give a seminar in  Auditorium 4, Vilhelm Bjerknes house, at 14:15, Tuesday June 17th: Assessment of Uncertainty in High Frequency Data: The Observed Asymptotic Variance

Time and place: June 13, 2014 10:15 AM - 12:00 PM, B 81

If B is a sub-Hopf algebra of the mod 2 Steenrod algebra, the category of B-modules has subcategories of modules local or colocal with respect to certain Margolis homologies, and corresponding localization and colocalization functors. The Picard groups of these subcategories are sufficient to detect the Picard group of the whole category and contain modules of geometric interest. General results obtained along the way allow us to begin to attack the analogous questions for E(2) and A(2)-modules. Applications include better descriptions of polynomial algebras as modules over the Steenrod algebra, and of the values of certain generalized cohomology theories on the classifying spaces of elementary abelian groups.   

Time and place: June 11, 2014 2:15 PM - 3:00 PM, B62, NH Abels hus

Gary Kennedy, Ohio State University, gives the Seminar in Algebra and Algebraic Geometry:

Convex bodies associated to spherical varieties

Time and place: June 11, 2014 11:15 AM - 12:00 PM, B62, NH Abel's building

Eduardo Esteves (IMPA, Rio de Janeiro), gives the Seminar in Algebra and Algebraic Geometry:

Compactified Jacobians of nodal curve and limit linear series

Time: June 10, 2014 2:15 PM

Diana Domanska (University of Silesia) gives a seminar in  Auditorium 4, Vilhelm Bjerknes house, at 14:15, Tuesday June 10th:

Forecasting methods.

 

 

Time and place: June 6, 2014 2:30 PM - 3:30 PM, Rest area, 7th floor, NHA

Abstract: The idea of this talk is to introduce the concept of o-minimal theories and give a sense in how it can be useful in different areas of mathematics. O-minimality is a branch of model theory which is concerned with understanding "tame" analytic expansions of the real closed field. I will give definitions and state some of the main properties of o-minimality. I will also state and sketch applications to statistical learning theory and state some of the new applications to algebraic geometry and Diophantine number theory.

 

Coffee/tea and cookies from 14.00.

 

Time and place: June 4, 2014 1:00 PM - 3:00 PM, NHA Hus, B71

Abstract: We talk about independent resolutions for dynamical systems on totally disconnected spaces. Building on earlier work by Cuntz, Echterhoff and Li that allows one to compute the K-theory of totally disconnected systems that admit a so called independent invariant regular basis, we show how any totally disconnected dynamical system admits a resolution of such systems, which in some cases allows for K-theory computations. Based on work by me and X. Li.

Time and place: June 3, 2014 1:15 PM - 3:00 PM, NHA B71

Marco Matassa (UiO) will give a talk with title: On dimension and integration for spectral triples associated to quantum groups

Abstract: Abstract: I will discuss some aspects of the notions of spectral dimension and non-commutative integral in the context of modular spectral triples. I will focus on two examples: the modular spectral triple for SU_q(2) introduced by Kaad and Senior and the family of spectral triples for quantum projective spaces introduced by D'Andrea and Dąbrowski.

Time and place: May 30, 2014 1:15 PM - 3:00 PM, NHA Hus, B71

Jens Kaad (Trieste), will give a talk with title "Joint torsion line bundles of commuting operators"

Abstract:

In this talk I’ll associate a holomorphic line bundle to any commuting tuple of bounded operators on a Hilbert space. The transition functions for this bundle are given by the joint torsion which compares determinants of Fredholm complexes. The joint torsion is an invariant of the second algebraic K-group of the Calkin algebra (bounded operators modulo trace class operators). The main step is to prove that the transition functions for the joint torsion line bundle are indeed holomorphic. This is carried out by studying the Quillen-Freed holomorphic determinant line bundle over the space of Fredholm complexes. In particular I will construct a holomorphic section of a certain pull-back of this bundle. The talk is based on joint work with Ryszard Nest.

 

Time and place: May 28, 2014 2:15 PM - 3:00 PM, B1036

Sara Ana Solanilla Blanco (University of Oslo) holder et seminar med tittelen: Approximation of the HDD and CDD temperature futures price dynamics

Time and place: May 28, 2014 11:15 AM - 12:00 PM, NHA Hus, B1036

Magnus D. Norling will give a talk with title "Universal coefficient theorem in KK-theory". This presentation is part of the final act of the course on "The Baum-Connes conjecture and KK-theory".