# Gjesteforelesninger, seminarer og konferanser

## Kommende

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

Abelian varieties II

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)

The two-day workshop on "Stochastics and Risk for Energy Markets" will consist of an intensive course on energy markets provided by Professor Rudiger Kiesel from University of Essen-Duisburg, as well as several invited talks. The workshop aims at bringing together practitioners from the energy and finance industry with researchers from academia.

## Tidligere

Parabolic optimal control problems with pointwise controls

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

Abelian varieties I

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.

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

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

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.

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

Convex bodies associated to spherical varieties

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

Compactified Jacobians of nodal curve and limit linear series

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

Forecasting methods.

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.

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.

This years Skolem Lecturer lecturer is professor Kit Fine, from New York University. Fine is known for his work in logic, the philosophy of language and metaphysics.

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.

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

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".

Bas Jordans will give a talk with title "Higson's characterization of KK-theory". This presentation is part of the final act of the course on "The Baum-Connes conjecture and Kasparov's KK-theory".

Steffen Grønneberg (BI Norwegian Business School), gives a seminar in Auditorium 4, Vilhelm Bjerknes house, at 14:15, Tuesday May 27th:

Econometric inference theories and multiple use of the same data

Jan Christophersen, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Local cohomology and cotangent cohomology of Plücker algebras

Professor Harry Zheng (Imperial College, London) holder et seminar med tittelen: Existence and Construction of Smooth Solutions to HJB Equations and Applications

Christian Peskine, Paris, gives the Seminar in Algebra and Algebraic Geometry:

Extrinsic geometry of projective complex elliptic curves of odd degree

Professor Yaozhong Hu (University of Kansas) holder et seminar med tittelen: Density convergence for some nonlinear Gaussian stationary sequences