Tidlegare gjesteforelesninger og seminarer - Side 72

Benjamin Holcblat (Department of Financial Economics, BI) will talk about

A Classical Moment-Based Approach with Bayesian Properties: Econometric Theory and Empirical Evidence from Asset Pricing

Extra seminar by Henkjan Honing (the Darwin Day vorspiel lecturer!)

Friday seminar by Sarah Randolph (NOTE THE TIME AND VENUE)

Gunther Cornelissen, Utrecht University (The Netherlands) will give a talk with title "Dynamical systems and point counting"

Abstract: Counting the points of a curve over finite fields doesn't determine the curve up to isomorphism; this is analogous to the famous fact that you cannot "hear the shape of a drum". I will show how to remedy this by counting points in a weighted way (namely, using abelian L-series). The method of proof is through the theory of dynamical systems, and - curiously - arose from a study of a quantum statistical mechanical system.  

Makoto Yamashita, p.t. University of Copenhagen, will give a talk with title "Tannaka-Krein duality of quantum homogeneous spaces"

Abstract: We study ergodic actions of compact quantum groups on operator algebras  (quantum homogeneous spaces) from the categorical point of view. The language of Rep(G)-module C*-categories gives a reconstruction theorem of quantum homogeneous spaces, which also captures the equivariant Morita equivalence and the equivariant homomorphisms.  For the case of quantum SU(2), the universality of Rep(SUq(2)) allows us to obtain a combinatorial description of quantum homogeneous spaces and their properties. Based on joint work with Kenny De Commer (arXiv:1211.6552, arXiv:1212.3413).  

Bjørn Jahren fortsetter seminaret om 4-mangfoldigheter.

Friday seminar by Bernt-Erik Sæther

Professor Erwan Rauwel, University of Tallinn, Tartu College, Estonia

Rama Cont (Imperial College) holder et seminar med tittelen: Functional Ito calculus and functional Kolmogorov equations

Magnus Dahler Norling, UiO, will give a talk with title: The K-theory of some reduced inverse semigroup C*-algebras

Abstract: We use a recent result by Cuntz, Echterhoff and Li about the K-theory of certain reduced C*-crossed products to describe the K-theory of C*_r(S) when S is an inverse semigroup satisfying certain requirements. A result of Milan and Steinberg allows us to show that C*_r(S) is Morita equivalent to a crossed product of the type handled by Cuntz, Echterhoff and Li. We apply the results to graph inverse semigroups and the inverse semigroups of one-dimensional tilings.

Michael Scheuerer will talk about (Institute of Applied Mathematics, Heidelberg University)

Statistical post-processing of weather forecasts: The importance of spatial modeling

Dette semesteret arrangerer vi et seminar om 4-mangfoldigheter, et felt som burde interessere både topologer og algebraiskgeometere. Dessuten, siden vi nå er i samme avdeling, bør vi jo ha noe felles aktivitet. Et overordnet mål er å studere komplekse flater opp til diffeomorfi. Det konkrete programmet vil bli til underveis, men emner vi regner med å komme innom inkluderer - Topologisk klassifikasjon av enkeltsammenhengende, kompakte   4-mangfoldigheter (Freedman) - Donaldsons teorem om snittformen til differensiable 4-mangfoldigheter - Enriques-Kodaira klassifikasjon av komplekse flater - Seiberg-Witten teori.

Vi starter opp mandag 28. januar 1415-1600 i B70 med at Bjørn snakker om snittformen og den topologiske teorien. Bjørn Jahren og Geir Ellingsrud

Program for the seminar in Logic, Spring 2013

Førsteamanuensis Luc Rouppe van der Voort, Institutt for teoretisk astrofysikk

Donna Mary Salopek (Uni. South Wales) holder et seminar med tittelen: Stochastic Evolution Equations driven by Liouville Fractional Brownian motion

Benedykt Szozda (Uni. Aarhus) holder et seminar med tittelen: Anticipative extension of the Ito integral

Thomas Jaki (Department of Mathematics and Statistics, Lancaster University) will talk about

Designing multi-arm multi-stage clinical studies

Matthew Sperrin (Department of Mathematics and Statistics, Lancaster University) will talk about

Modelling the effect of interventions on onset and progression of chronic disease

Friday seminar by Jeffrey Hutchings

Fred Shultz, Wellesley College, USA will give a talk with title "Decomposing separable states".

This is the first in a joint seminar series organised by the Operator Algebra group (UiO), Several Complex Variable group (UiO) and the CAS group.  The plan is to have seminars every other week.  

Abstract: This talk will begin with a brief introduction to entanglement and its applications, since that motivates the mathematics to be discussed.  In the title of this talk, a state is a positive linear functional on the tensor product of the algebras of m x m and n x n complex matrices.  Such a state is separable if it is a convex combination of product states. An interesting open problem is to give a useful criterion for a state to be separable. A related problem is to give a systematic way to find a decomposition of a separable state into a convex combination of product states.  This talk will describe such a decomposition for a class of separable states that is of both physical and mathematical interest.  This decomposition is also applicable to a class of completely positive maps (which correspond to certain quantum channels). This is joint work with Erik Alfsen.  

Paul Kruehner, MAWREM/CMA, holder et seminar med tittelen: Subordination of Hilbert space valued Lévy processes

Magnus Landstad (NTNU) will give a talk with title: Exotic group C*-algebras and noncommutative duality.

Abstract: It  has long been known that for a (non-amenable) locally compact group G there are many C*-algebras between the full and reduced group C*-algebra. First I will discuss to what extent these intermediate algebras can be called group C*-algebras. Then I will look at algebras between the full and reduced crossed product, and the various types of coactions (full, maximal, normal) a group can have. To make arguments a little simpler, we shall assume G to be discrete.

Friday seminar by Barbara Bramanti