Tidligere arrangementer - Side 87

ESOP organises a workshop on "Globalisation, Migration and the Labour Market" in relation to the European Strains research project. 

Erik B?lviken (University of Oslo) gives a lecture with the title: Where models meet reality - The Solvency II regulation of  European insurance

Kimmo Kainulainen, University of Jyvaskyla

The Oslo-Seminar in Mathematical Logic will take place at the same time and in the same location as in the previous terms.

Thursdays 10.15 - 12.00 in the meeting room of floor 9 in the computer science building.

The Barratt nerve BSd X of the Kan subdivision Sd X of a simplicial set X \in sSet is a triangulation. The Barratt nerve is defined as taking the poset of non-degenerate simplices, thinking of it as a small category and then finally taking the nerve.Waldhausen, Jahren and Rognes (Piecewise linear manifolds and categories of simple maps) named this construction 'the improvement functor' because of the homotopical properties and because its target is non-singular simplicial sets. A simplicial set is said to be 'non-singular' if its non-degenerate simplices are embedded. There is a least drastic way of making a simplicial set non-singular called 'desingularization', which is a functor D:sSet -> nsSet that is left adjoint to the inclusion. The functor DSd^{^2} is the left Quillen functor of a Quillen equivalence where the model structure on sSet is the standard one where the weak equivalences are those that induce weak homotopy equivalences and the fibrations are the Kan fibrations. I will talk about the main steps of the proof that the natural map DSd X -> BX is an isomorphism for regular X. This implies that DSd^{^2} is a triangulation and that the improvement functor is less ad hoc than it may seem. Furthermore, I will explain how the result provides evidence that any cofibrant non-singular simplicial set is the nerve of some poset.   

We will have a ¡°mingle¡± meeting. There will be updates from Kristine and Luc on the running of the institute. But fear not, there will also be plenty of time for informal chat and eating of cake. All are welcome to the lobby on the first floor.

A conference celebrating the work of Ragni Piene on the occasion of her 70th birthday.

Hot Topics in Liver MRI.

By Claudio Sillero from University of Oxford (NB: Note the time!)

Jochen Weller, Ludwig-Maximilians Universit?t, Munich

Johan Peter Uldall Fynbo, Professor DARK cosmology Centre, Niels Bohr Institute, University of Copenhagen

Triangulated categories of motives over schemes are sort of the "universal derived categories" among various derived categories obtained by various cohomology theories like l-adic cohomology. Ayoub constructed them using the A1-homotopy equivalences and ¨¦tale topology. I will introduce the construction of triangulated categories of motives over fs log schemes. Fs log schemes are kinds of "schemes with toroidal boundary," and A1-homotopy equivalences and ¨¦tale topology are not enough to obtain all homotopy equivalences between fs log schemes. I will explain what extra homotopy equivalences and topologies are neeeded. 

Seminar nr. 2 i nettverk for digitalisering i statsforvaltningen. Om samspillet mellom regelverksutvikling og digitalisering.

Daniel Roy (Department of Statistical Sciences, University of Toronto) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.

Ulrik Bo Rufus Enstad (Oslo) will give a talk with title: Connections between Gabor frames and Noncommutative Tori

Abstract: A Gabor frame is a special type of frame in the Hilbert space of square-integrable functions on the real line. Gabor frames provide robust, basis-like representations of functions, and have applications in a wide range of areas. They have a duality theory which is deeply linked to Rieffel¡¯s work on imprimitivity bimodules over noncommutative tori. We explore several links between Gabor frames and noncommutative tori, and show how operator algebras can be used to give alternative proofs of theorems from time-frequency analysis.  This talk is based on my Master¡¯s thesis written at NTNU, which reviews Franz Luef¡¯s work on the connections between Gabor frames and modules over noncommutative tori, as well as some joint work with Franz Luef.

ESOP seminar. The title of the seminar is "High performance computing resources at UiO", and will include short presentations by USIT and Morten Hjorth-Jensen, as well as a Q&A session.

Nacira Agram (University of Oslo) gives a lecture with the title: Model Uncertainty Stochastic Mean-Field Control.

Reza Lahidji, Executive Advisor, Director of Quantitative Research, International Law and Policy Institute 

A continuation of part I.

Hepatic macrophage heterogeneity in liver diseases ¨C from pathogenesis to novel therapeutic strategies

John Quigg, Arizona State University (Tempe), USA, will give a talk with title "The Pedersen rigidity problem".

University of Abstract: If \alpha is an action of a locally compact abelian group G on a C*-algebra A, Takesaki-Takai duality recovers (A,\alpha) up to Morita equivalence from the dual action of \widehat{G} on the crossed product A\rtimes_\alpha G. Given a bit more information, Landstad duality recovers (A,\alpha) up to isomorphism. In between these, by modifying a theorem of Pedersen, (A,\alpha) is recovered up to outer conjugacy from the dual action and the position of A in M(A\rtimes_\alpha G). Our search (still unsuccessful, somehow irritating) for examples showing the necessity of this latter condition has led us to formulate the "Pedersen rigidity problem". We present numerous situations where the condition is redundant, including G discrete or A stable or commutative. The most interesting of these "no-go theorems" is for locally unitary actions on continuous-trace algebras. This is joint work with Steve Kaliszewski and Tron Omland. 

Riccardo De Bin (Department of Mathematics, University of Oslo) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.