## Visiting address

Ullevål StadionSognsveien 77B

0855 OSLO

Norway

Time and place:
Nov. 19, 2014 2:15 PM - 4:00 PM,
NHA B71

Martijn Caspers (Münster) will give a talk with title: The Haagerup property for arbitrary von Neumann algebras

Abstract: The Haagerup property is an approximation property for both groups and operator algebras that has important applications in for example the Baum-Connes conjecture or von Neumann algebra theory. In this talk we show that the Haagerup property is an intrinsic invariant of an arbitrary von Neumann algebra. We also discuss stability properties of the Haagerup property under constructions as free products, graph products and crossed products. Finally we discuss alternative characterizations in terms of the existence of suitable quadratic forms.

Time and place:
Nov. 18, 2014 2:15 PM - 3:00 PM,
room 107, 1st floor N.H. Abels House

Jan Fredrik Bjørnstad (Statistics Norway and Dept. of Math.,UiO) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 November 18th: Survey sampling the way I see it.

Time and place:
Nov. 18, 2014 10:15 AM - 12:00 PM,
B935 NHA

This is a work we had done jointly with Garkusha (after Voevodsky) arXiv:1409.4372. Using the machinery of framed sheaves developed by Voevodsky, a triangulated category of framed motives is introduced and studied. To any smooth algebraic variety X in Sm/k, the framed motive M_fr(X) is associated in that category . Also, for any smooth scheme X in Sm/k an explicit quasi-fibrant motivic replacement of its suspension P1-spectrum is given. Moreover, it is shown that the bispectrum (M_fr(X),M_fr(X)(1),M_fr(X)(2), ... ), each term of which is a twisted framed motive of X, has motivic homotopy type of the suspension bispectrum of X. We also construct a compactly generated triangulated category of framed bispectra SH_fr(k) and show that it reconstructs the Morel-Voevodsky category SH(k). As a topological application, it is proved that the framed motive M_fr(pt)(pt) of the point pt = Speck evaluated at pt is a quasi-fibrant model of the classical sphere spectrum whenever the base field k is algebraically closed of characteristic zero.

Time and place:
Nov. 17, 2014 10:15 AM - 12:00 PM,
B62 NHA

The goal of this talk is to present some recent computations of the Picard groups of several spectra of topological modular forms. The first part of the talk will introduce the toolbox, which consists of descent theory and a technical lemma allowing us to compare stable and unstable information in spectral sequences. This is joint work with Akhil Mathew.

Time and place:
Nov. 13, 2014 3:00 PM - 3:45 PM,
Pauseareal 10th floor, NHA

Finite Element Exterior Calculus and Applications

Time and place:
Nov. 13, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

George Hitching, Høgskolen i Oslo og Akershus, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties XI

Time and place:
Nov. 12, 2014 9:15 AM - 10:00 AM,
B1036, 10th floor, NHA

Weak approximation of stochastic differential equations by a multilevel Monte Carlo method using mean square adaptive numerical integration

Time and place:
Nov. 11, 2014 2:15 PM - 3:00 PM,
room 107, 1st floor N.H. Abels House

Tore Selland Kleppe (University of Stavanger) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 November 11th: Bandwidth Selection In Pre-Smoothed Particle Filters

Time and place:
Nov. 5, 2014 2:15 PM - 4:00 PM,
NHA B71

Marco Matassa (UiO) will give a talk with title: Dirac Operators on Quantum Flag Manifolds

Abstract: I will review the paper "Dirac Operators on Quantum Flag Manifolds" by Ulrich Krähmer. The aim is to define Dirac operators on quantized irreducible flag manifolds. These will yield Hilbert space realizations of some distinguished covariant first-order differential calculi.

Time and place:
Oct. 30, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

Geir Ellingsrud, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties X

Time and place:
Oct. 27, 2014 9:00 AM -
Oct. 28, 2014 4:00 PM,
The Academy of Sciences and Letters

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.

Time and place:
Oct. 23, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

Daniel Larsson, Høgskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties IX

Time and place:
Oct. 23, 2014 10:15 AM - 12:00 PM,
NHA bygget 9 etg B91

The Lattice Boltzmann Method and its application in modeling of physiological flows

Time and place:
Oct. 16, 2014 3:00 PM - 3:45 PM,
Pauseareal 10th floor, NHA

The value of information in stochastic control and finance

Time and place:
Oct. 16, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

Daniel Larsson, Høgskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties VIII

Time and place:
Oct. 15, 2014 2:15 PM - 4:00 PM,
NHA Hus, B71

Adam Sørensen (UiO) will give a talk with title: Almost commuting matrices

Abstract: Two matrices A,B are said to almost commute if AB is close to BA (in a suitable norm). A question of Halmos, answered by Lin, asks if two almost commuting self-adjoint matrices are always close to two exactly commuting self-adjoint matrices. We will survey what is known about this and similar questions, and report on recent work with Loring concerning how the questions change if we look at real rather than complex matrices.

Time and place:
Oct. 14, 2014 2:15 PM,
Room 107, N.H.Abels House

Kristan Ranestad (Dept. of Math, UiO) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 Tuesday October 14th. Algebra og statistics: Phylogenetic models from an algebraic geometric viewpoint

Time and place:
Oct. 10, 2014 1:15 PM,
Undervisningsrom 107, Niels Henrik Abels hus

M.Sc. Knut Vedeld ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.: Mechanical behaviour of layered cylinders and applications to offshore lined and clad pipelines

Time and place:
Oct. 10, 2014 10:15 AM,
Undervisningsrom 107, Niels Henrik Abels hus

M.Sc. Knut Vedeld ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "Offshore windmills - design of existing structures and challenges for more exposed areas".

Time and place:
Oct. 9, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

Kristian Ranestad, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties VII

Time and place:
Oct. 9, 2014 1:15 PM,
Undervisningsrom 108, Niels Henrik Abels hus

M.Sc. Jostein Kolaas ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.: Optimizing of optical measurement techniques in fluid mechanics with applications to micro fluidics, multiphase flow and water waves

Time and place:
Oct. 9, 2014 10:15 AM,
Undervisningsrom 108, Niels Henrik Abels hus

M.Sc. Jostein Kolaas ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "Surface and interface tension: physics and challenges for advanced measurement techniques".

Time and place:
Oct. 2, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

Daniel Larsson, Høgskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties VI

Time and place:
Sep. 26, 2014 1:15 PM,
Aud. 5 Vilhelm Bjerknes' hus

M. Sc. Gudmund Horn Hermansen ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.: Model selection and Bayesian nonparametrics for time series and non-standard regression models

Time and place:
Sep. 26, 2014 10:15 AM - 4:00 PM,
Sophus Bugge, seminar room 3.