Tidlegare gjesteforelesninger og seminarer - Side 61

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.

Multi-index Monte Carlo and Multi-index Stochastic Collocation

Patrick Peter, Directeur de Recherche CNRS, IAP-Paris

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).

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.

By Stephanie M. Carlson

Amelie Neuville, Postodoctoral fellow with IRIS (International Research Institute of Stavanger), in collaboration with the University of Oslo, PGP group (Physics of geological processes)

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.

Guest lecture by professor Victor Zammit, Warwick Medical School, University of Warwick, Coventry, United Kingdom

Guest lecture by Professor Bruno Sarmento, Porto, Portugal.

By David Houle from Florida State University

 Tom Ayres (Center for Astrophysics & Space Astronomy, University of Colorado at Boulder)

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

Guest lecture by Dr. Christian Pfeifer, Christian Albrechts University, Kiel, Germany.

Sverre Holm, professor, Institutt for informatikk / Dept. of Informatics

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 

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

We will have a new “mingle” meeting on Friday at 11.15 (as usual). The main attraction will be Ingunn Wehus and Signe Riemer-Sorensen.   

 Otherwise there will be updates from Kristine and Viggo 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.

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

Ideals of points and Waring problems for polynomials​

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.

Martin BUCHER, Directeur de Recherche, CNRS, Paris

Velkommen på likestillingsseminar på MN-fakultetet 9. mai. 

Ainar Drews, PhD , ITA