Visiting addressUllevål Stadion Sognsveien 77B
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.
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
Kristian Ranestad, UiO, gives the Seminar in Algebra and Algebraic Geometry:
Abelian varieties VII
Daniel Larsson, Høgskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:
Abelian varieties VI
Generalized barycentric coordinates and applications
Olav Gravir Imenes, Høgskolen i Oslo og Akershus, gives the Seminar in Algebra and Algebraic Geometry:
Abelian varieties V
Victor Haughton, Professor of Radiology at the University of Wisconsin
and Adjunct Research Scientist at Simula Research Laboratory
Variational integrators for interconnected Lagrange-Dirac dynamical systems
Ørnulf Borgan (Department of Mathematics,UiO) gives a seminar
in room 107, 1st floor N.H. Abels House at 14:15 Tuesday September 23rd:
Using cumulative sums of martingale residuals for model checking in nested case-control studies
Andrea Hofmann, Høgskolen i Østfold, gives the Seminar in Algebra and Algebraic Geometry:
Abelian varieties IV
Abstract: We show that the discrete duals of the so called free orthogonal quantum groups have the completely contractive approximation property, analogous to the free groups. The proof relies on the structure of representation categories of these quantum groups, on the C*-algebraic structure of SUq(2), and on the free product techniques of Ricard and Xu. This talk is based on joint work with Kenny De Commer and Amaury Freslon.
Welcome to the conference on Stochastics of Environmental and Financial Economics. The conference will bring together leading researchers in the fields of stochastic analysis and finance to discuss recent developments and challenges with an edge towards energy, environmental and financial markets.
Arne B. Sletsjøe, UiO, gives the Seminar in Algebra and Algebraic Geometry:
Abelian varieties III
Abstract: Independence has been introduced as a regularity property for pairs of commuting injective group endomorphisms of a discrete abelian group with finite cokernel by Joachim Cuntz and Anatoly Vershik. We discuss various characterisations of this regularity property and show how the statements need to be adjusted when removing the restrictions that the group has to be abelian and that the cokernels have to be finite. Somewhat surprisingly, this leads to the concept of *-commutativity. This property is defined for pairs of commuting self-maps of an arbitrary set. As an examples of *-commutativity, we explain a construction related to the Ledrappier shift and indicate how one obtains examples for independent group endomorphisms from this construction. If time permits, we will point out instances where the two notions have been readily used to obtain C*-algebraic results. Roughly speaking, both notions are designed to give rise to pairs of doubly commuting isometries, which significantly simplifies the analysis of the constructed C*-algebras. This is particularly useful when one tries to generalise results from the case of a single transformation to an action generated by finitely many transformations.
Fredrik Meyer, UiO, gives the Seminar in Algebra and Algebraic Geometry:
Abelian varieties II
Parabolic optimal control problems with pointwise controls
Arvid Siqveland, Høgskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:
Abelian varieties I
The logic seminar will take place in B63 in NHA on Thursdays from 10.15 to 12.00.
The program is tentative. There are free slots in the program. Contact Dag Normann for suggestions or questions.
Three-dimensional instability of solitary water waves
Jocelyne Bion-Nadal (CNRS and Ecole Polytechnique) holder et seminar med tittelen: Martingale problem for integro-differential operators with path dependent coefficients
Per A. Mykland (The University of Chicago) og Lan Zhang (University of Illinois at Chicago) give a seminar in Auditorium 4, Vilhelm Bjerknes house, at 14:15, Tuesday June 17th: Assessment of Uncertainty in High Frequency Data: The Observed Asymptotic Variance
If B is a sub-Hopf algebra of the mod 2 Steenrod algebra, the category of B-modules has subcategories of modules local or colocal with respect to certain Margolis homologies, and corresponding localization and colocalization functors. The Picard groups of these subcategories are sufficient to detect the Picard group of the whole category and contain modules of geometric interest. General results obtained along the way allow us to begin to attack the analogous questions for E(2) and A(2)-modules. Applications include better descriptions of polynomial algebras as modules over the Steenrod algebra, and of the values of certain generalized cohomology theories on the classifying spaces of elementary abelian groups.
Gary Kennedy, Ohio State University, gives the Seminar in Algebra and Algebraic Geometry:
Convex bodies associated to spherical varieties
Eduardo Esteves (IMPA, Rio de Janeiro), gives the Seminar in Algebra and Algebraic Geometry:
Compactified Jacobians of nodal curve and limit linear series