## Visiting address

Ullevål StadionSognsveien 77B

0855 OSLO

Norway

Time and place:
May 26, 2015 2:15 PM - 3:00 PM,
Room U32 (Note: Floor -1), Niels Henrik Abel's Building

Stein Andreas Bethuelsen (Universiteit Leiden) gives a lecture with the title: Random walks in (dynamic) random environment

Time and place:
May 26, 2015 2:00 PM - 4:00 PM,
NHA B735

Marco Matassa (UiO) will give a talk with title The Dolbeault-Dirac operator on quantized projective spaces, revisited

Abstract: In this talk I will present a new construction for the Dolbeault-Dirac operator on quantum projective spaces, the main result being the computation of its square. This clarifies and generalizes some results of D'Andrea-Dąbrowski. Moreover it gives a class of explicit examples of the general construction of Krähmer-Tucker Simmons, which deals with such operators on irreducible generalized flag manifolds.

Time and place:
May 23, 2015 -
May 24, 2015,
University of Oslo

Fourteenth International Workshop

Time and place:
May 21, 2015 2:15 PM - 4:00 PM,
B62, NH Abels hus

Carsten Lütken, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Modular curves VIII

Time and place:
May 21, 2015 1:15 PM - 2:15 PM,
Georg Sverdrups hus, Aud. 1

The Skolem Lecture is an annual event in honor of the Norwegian mathematician and logician Thoralf Skolem.

This years Skolem Lecturer will be

Michael Rathjen, The University of Leeds:

"On relating strong type theories and set theories"

Time and place:
May 21, 2015 -
May 22, 2015,
University of Oslo

Time and place:
May 12, 2015 11:00 AM - 12:00 PM,
B735

Roberto Conti (La Sapienza, Rome) will give a talk with title "C*-algebras and Fourier theory"

Time and place:
May 6, 2015 2:15 PM - 4:00 PM,
B735

Robert Yuncken (Univ. Clermont-Ferrand II, France) will give a talk with title: A groupoid approach to pseudodifferential operators

Abstract: Connes introduced the "tangent groupoid" of a manifold as a geometric device for linking a classical pseudodifferential operator to its symbol, yielding a novel proof of the Atiyah-Singer index theorem. Since then, numerous variations on the tangent groupoid have been produced, each adapted to a different class of pseudodifferential operators. In this talk we will consider the reverse problem: associating to a given tangent groupoid a pseudodifferential calculus. We shall show that the kernels of classical pseudodifferential operators are precisely the essentially homogeneous fibrewise distributions on Connes' tangent groupoid. This leads to a natural pseudodifferential calculus of subelliptic type on a manifold with a filtration on its Lie algebra of vector fields.

Time and place:
Apr. 30, 2015 2:15 PM - 4:00 PM,
B62, NH Abels hus

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

Modular curves VII

Time and place:
Apr. 30, 2015 11:15 AM - 12:00 PM,
Room 1036 (Niels Henrik Abels hus)

**Comments on the Galilean limits of Maxwell's equations**

Time and place:
Apr. 27, 2015 11:15 AM - 12:00 PM,
Room 1036 (Niels Henrik Abels hus).

Convex relaxation, graph cut and continuous max-flow algorithms for image processing and computer vision.

Time and place:
Apr. 23, 2015 2:15 PM - 4:00 PM,
B62, NH Abels hus

Pietro De Poi (Udine), gives the Seminar in Algebra and Algebraic Geometry:

A Severi type theorem on surfaces in P^6

Time and place:
Apr. 20, 2015 -
Apr. 24, 2015,
The Norwegian Academy of Sciences and Letters

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)

Time and place:
Apr. 16, 2015 2:15 PM - 4:00 PM,
B62, NH Abels hus

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

Modular curves VI

Time and place:
Apr. 16, 2015 2:00 PM - 3:00 PM,
Niels Henrik Abels hus, room 1036

Prof. Dr. Alois Gisler (ETH Zurich, RiskLab Switzerland) holds a seminar with the title "On the Development of the Swiss Solvency Test"

Time and place:
Apr. 15, 2015 3:00 PM,
Sparebank 1

Prof. Dr. Alois Gisler (ETH Zurich, RiskLab Switzerland) holds a seminar with the title "The Reserve Risk of the Chain-Ladder Reserving Method from a New Perspective"

Time and place:
Apr. 15, 2015 2:15 PM - 3:15 PM,
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.

Time and place:
Apr. 13, 2015 12:15 PM - 2:00 PM,
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.

Time and place:
Apr. 10, 2015 10:15 AM - 11:15 AM,
NHA B1036

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

Time and place:
Apr. 10, 2015 -
Apr. 11, 2015,
The Norwegian Academy of Sciences and Letters

Time and place:
Apr. 8, 2015 2:15 PM - 3:00 PM,
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).

Time and place:
Mar. 26, 2015 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:

Modular curves V

Time and place:
Mar. 25, 2015 2:15 PM -
Mar. 23, 2015 4:00 PM,
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.

Time and place:
Mar. 25, 2015 1:00 PM - 3:00 PM,
"bikuben" - Kristine Bonnevies hus

Time and place:
Mar. 25, 2015 12:00 PM - 2:30 PM,
Nuklus - 2+3 in Kristine Bonnevies hus (Biology building)