Gjesteforelesninger, seminarer og konferanser

Kommende

Tid og sted: 5. sep. 2016 13:00 - 7. sep. 2016 16:00, Meeting room 12th Floor NHA hus

On 5-7 September the first STORE PHD Gathering will take place, with two intensive courses. The first is on the new class of stochastic processes called Trawl processes and instructed by Almut Veraart from Imperial College London, UK. The second is led by Rudiger Kiesel from University of Duisburg-Essen, Germany, and focuses on intra-day trading of electricity. 

Tid: 6. sep. 2016 14:15

Håvard Kvamme (UiO, Dept. of mathematics) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.

Tid og sted: 8. sep. 2016 14:15 - 15:15, B637 NHA

In the nineties, Deninger gave a detailed description of a conjectural cohomological interpretation of the (completed) Hasse-Weil zeta function of a regular scheme proper over the ring of rational integers. He envisioned the cohomology theory to take values in countably infinite dimensional complex vector spaces and the zeta function to emerge as the regularized determinant of the infinitesimal generator of a Frobenius flow. In this talk, I will explain that for a scheme smooth and proper over a finite field, the desired cohomology theory naturally appears from the Tate cohomology of the action by the circle group on the topological Hochschild homology of the scheme in question.  

Tid og sted: 9. sep. 2016 - 10. sep. 2016, Klækken Hotell

The statistics groups at the University of Oslo and the Norwegian University of Life Sciences invite all PhD-students and postdocs within statistics in the Oslo-region as well as their teachers and supervisors to a  2-days workshop.

Tidligere

Tid: 25. aug. 2016 14:15

Prof. Yasunori Fujikoshi​ (Hiroshima University​) will give a seminar in Sverdrups plass (lunch area), 8th floor, Niels Henrik Abels hus at 14:15.

Tid og sted: 25. aug. 2016 10:15 - 12:00, 9th floor-Ole Johan Dahls hus

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

Tid og sted: 25. aug. 2016 10:15 - 12:00, 9th floor-Ole Johan Dahls hus

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

Tid: 16. aug. 2016 14:15

Andrea Cremaschi (earlier University of Kent, now UiO) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.

Tid og sted: 16. aug. 2016 10:15, B 738 NHA

Bloch constructed higher cycle class maps from higher Chow groups to Deligne cohomology and étale cohomology. I will define a map from the motivic Eilenberg-Mac Lane spectrum to the spectrum representing Deligne cohomology in the motivic stable homotopy category over C such that it gives Bloch's higher cycle class map on cohomology. The map is induced by the map from Voevodsky's algebraic cobordism spectrum MGL to the Hodge-filtered complex cobordism spectrum defined by Hopkins-Quick. This extends a result of Totaro showing that the usual cycle class map to singular cohomology factors through complex cobordism modulo the coefficients of the Lazard ring MU^{2*} tensor_L Z. This is joint work with Amit Hogadi.

Tid og sted: 11. aug. 2016 14:15 - 15:00, Niels Henrik Abels hus, room 935

Yaozhong Hu (University of Kansas, USA) gives a lecture with the title: Rate of convergence and asymptotic error distribution of Euler approximation schemes for fractional diffusions

Tid og sted: 11. aug. 2016 13:15 - 14:00, Niels Henrik Abels hus, room 935

Olfa Draouil (University of Tunis El Manar, Tunisia) gives a lecture with the title: Optimal insider control of stochastic partial differential equations

Tid og sted: 24. jun. 2016 10:15 - 11:00, NHA, room 1036

Multi-index Monte Carlo and Multi-index Stochastic Collocation

Tid og sted: 23. jun. 2016 - 28. jun. 2016, Quality Hotel, Tønsberg, Norway

www.mn.uio.no/MMCS9

The conference is part of a joint French-Norwegian conference series on curves and surfaces. In Norway previous meetings were held in Oslo 1988, Biri 1991, Ulvik 1994, Lillehammer 1997, Oslo 2000, Tromsø 2004, Tønsberg 2008, and Oslo 2012. In France the last meeting was in Paris 2014.  

Tid og sted: 16. jun. 2016 10:15 - 12:00, NHA B735

In this talk I will present a paper by D. Bisch, R. Nicoara and S. Popa where continuous families of irreducible subfactors of the hyperfinite II_1 factor which are non-isomorphic, but have all the same standard invariant are constructed. In particular, they obtain 1-parameter families of irreducible, non-isomorphic subfactors of the hyperfinite II_1 factor with Jones index 6, which have all the same standard invariant with property (T).

Tid: 14. jun. 2016 14:15 - 15:00

Igor Barros Barbosa (PhD candidate at Department of Computer and Information Science at NTNU) gives a seminar on deep learning at Department of Mathematics on the 8th floor of Niels Henrik Abels hus.

Tid og sted: 9. jun. 2016 14:15 - 16:00, B738, NH Abels hus

Ritwik Mukherjee (TIFR) gives the Seminar in Algebra and Algebraic Geometry:

Title: Enumerative Geometry of singular curves in a Linear System

Abstract: Enumerative geometry is a branch of mathematics that deals with the following question: "How many geometric objects satisfy certain constraints". A well known class of enumerative question is to count curves in a linear system H^0(X,L) that have some prescribed singularities. In this talk we will describe a topological method to approach this problem. We will express the enumerative numbers as the Euler class of an appropriate bundle. We will then go on to explain how we compute the degenerate contribution of the Euler class using a topological method.

Tid og sted: 2. jun. 2016 10:15 - 12:00, Georg Sverdrups Hus

The Skolem Lecturer of 2016 will be Stewart Shapiro from Ohio State University

Tid og sted: 1. jun. 2016, Abels utsikt, 12.etasje i Niels Henrik Abels hus

We invite you to a one-day workshop celebrating Professor Bent Natvig's 70th anniversary. Invited speakers will present recent developments in some of the areas where Bent has made significant contributions, including reliability theory and mathematical statistics.

Bent Natvig has, since 1986, been a professor of mathematical statistics at the Department of Mathematics. He is the author of a long list of important papers published in top-ranked scientific journals as well as the recent book entitled "Multistate Systems Reliability Theory with Applications" (John Wiley & Sons). At our department, Bent has taken the leading role in the area of reliability theory. On August 1 this year, he turns 70.

 

Tid og sted: 30. mai. 2016 14:15 - 15:00, Niels Henrik Abels hus, room 801

Dr. Nacira Agram (University of Biskra, Algeria) gives a lecture with the title: Stochastic optimal control of McKean-Vlasov equations with anticipating law.

Tid og sted: 26. mai. 2016 14:15 - 16:00, B738, NH Abels hus

John Christian Ottem, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Title: Moduli of K3s via Global Torelli

Abstract: I'll give a brief account of the Torelli theorems and the construction of the moduli space of K3 surfaces 

Tid: 24. mai. 2016 14:15

Abhik Ghosh (Dept. of Biostatistics, UiO) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15. 

Tid og sted: 19. mai. 2016 14:15 - 16:00, NHA B735

Abstract: This talk addresses some of the fundamental barriers in the theory of computations. Many computational problems can be solved as follows: a sequence of approximations is created by an algorithm, and the solution to the problem is the limit of this sequence (think about computing eigenvalues of a matrix for example). However, as we demonstrate, for several basic problems in computations such as computing spectra of operators, solutions to inverse problems, roots of polynomials using rational maps, solutions to convex optimization problems, imaging problems etc. such a procedure based on one limit is impossible. Yet, one can compute solutions to these problems, but only by using several limits. This may come as a surprise, however, this touches onto the boundaries of computational mathematics. To analyze this phenomenon we use the Solvability Complexity Index (SCI). The SCI is the smallest number of limits needed in order to compute a desired quantity. The SCI phenomenon is independent of the axiomatic setup and hence any theory aiming at establishing the foundations of computational mathematics will have to include the so called SCI Hierarchy. We will specifically discuss the vast amount of classification problems in this non-collapsing complexity/computability hierarchy that occur in inverse problems, compressed sensing problems, l1 and TV optimization problems, spectral problems, PDEs and computational mathematics in general.

Tid og sted: 19. mai. 2016 14:15 - 16:00, B738, NH Abels hus

Alessandro Oneto​ (Stockholm)​ gives the Seminar in Algebra and Algebraic Geometry:

Ideals of points and Waring problems for polynomials​

Tid og sted: 9. mai. 2016 - 14. mai. 2016, Oslo and Akershus University College

The conference "Quantum groups: geometry, representations, and beyond" will take place on May 9-14, 2016.

Tid og sted: 4. mai. 2016 14:15 - 16:00, NHA B735

Abstract:  In a recent work with R. Conti (La Sapienza Univ., Rome), we have introduced a notion of positive definiteness for certain functions associated to a (unital, discrete) C*-dynamical system. We will sketch the proof of a Gelfand-Raikov type theorem for such functions and use it to construct complete positive maps on the full and the reduced C*-crossed products of the system. We will also explain how a natural definition of amenability for C*-dynamical systems emerges from our work.