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Gjesteforelesninger, seminarer og konferanser

Kommende

Tid og sted: 23. okt. 2014 14:15 - 16:00, B62, NH Abels hus

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

Abelian varieties IX

Tid og sted: 27. okt. 2014 09:00 - 28. okt. 2014 16:00, 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.

Tidligere

Tid og sted: 20. okt. 2014 10:15 - 12:00, B 62 NHA

Jeg vil snakke om de endelige underalgebraene A(n) i Steenrodalgebraen, analysere A(n)-modulstrukturen til den kontinuerlige kohomologien til Tatekonstruksjonen, og skissere Lin-Davis-Mahowald-Adams' bevis av Lins teorem. 

Tid og sted: 16. okt. 2014 15:00 - 15:45, Pauseareal 10th floor, NHA

The value of information in stochastic control and finance

Tid og sted: 16. okt. 2014 14:15 - 16:00, B62, NH Abels hus

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

Abelian varieties VIII

Tid og sted: 15. okt. 2014 14:15 - 16:00, 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.

 

Tid og sted: 14. okt. 2014 14:15, 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

 

Tid og sted: 13. okt. 2014 10:15 - 12:00, B 62 NHA

Jeg avslutter reduksjonen av Segalformodningen til et algebraisk spørsmål om en Ext-ekvivalens, og vil se i mer detalj på hvordan Pontryagin--Thom-konstruksjonen brukes til å bevise Wirthmüller- og Adams transfer-ekvivalensene i stabil ekvivariant homotopiteori. 

Tid og sted: 9. okt. 2014 14:15 - 16:00, B62, NH Abels hus

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

Abelian varieties VII

Tid og sted: 2. okt. 2014 14:15 - 16:00, B62, NH Abels hus

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

Abelian varieties VI

Tid og sted: 26. sep. 2014 10:15 - 16:00, Sophus Bugge, seminar room 3.
Tid og sted: 25. sep. 2014 15:00 - 15:45, Pauseareal 10th floor, NHA

Generalized barycentric coordinates and applications

Tid og sted: 25. sep. 2014 14:15 - 16:00, B62, NH Abels hus

Olav Gravir Imenes, Høgskolen i Oslo og Akershus, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties V

Tid og sted: 23. sep. 2014 15:15 - 16:00, B1036, 10th floor, NHA

Variational integrators for interconnected Lagrange-Dirac dynamical systems

Tid: 23. sep. 2014 14:15

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  

Tid og sted: 22. sep. 2014 10:15 - 12:00, B 62 NHA

Jeg vil vise hvordan Segalformodningen kan omformuleres, ved hjelp av Tatekonstruksjonen, norm-restriksjonssekvensene, Warwick dualitet og Adams' transferekvivalens, til en form som lettere lar seg bevise v.h.a. den algebraiske Singerkonstruksjonen. Dette er det andre i en serie foredrag som sikter mot å gi et bevis for en versjon av Segalformodningen i motivisk homotopiteori. 

Tid og sted: 18. sep. 2014 14:15 - 16:00, B62, NH Abels hus

Andrea Hofmann, Høgskolen i Østfold, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties IV

Tid: 17. sep. 2014 14:00 - 16:00

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.

Tid og sted: 15. sep. 2014 12:15 - 14:15, B 70 NHA

Motivert av Atiyah og Segals kompletteringsteorem for ekvivariant topologisk K-teori formulerte Graeme Segal en tilsvarende formodning om ekvivariant stabil kohomotopi. Jeg vil minne om hva teoremet og formodningen sier, og vise hvordan Segalformodningen kan omformuleres, ved hjelp av norm-restriksjonssekvensene, til en form som lettere lar seg bevise v.h.a. den algebraiske Singerkonstruksjonen. Tanken er at dette skal være det første av en serie foredrag som sikter mot å gi et bevis for en versjon av Segalformodningen i motivisk homotopiteori. Dette var temaet for Thomas Gregersens PhD-avhandling fra 2012.

 

Tid og sted: 15. sep. 2014 - 19. sep. 2014, The Norwegian Academy of Sciences and Letters

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.

The conference is organized by the Center of Advanced Studies (CAS), Stochastics of Environmental and Financial Economics. Scientific organizers: Fred Espen Benth and Giulia Di Nunno (UiO).

Tid og sted: 11. sep. 2014 14:15 - 16:00, B62, NH Abels hus

Arne B. Sletsjøe, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties III

Tid og sted: 10. sep. 2014 15:15 - 16:15, B71, NHA

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.

Tid og sted: 4. sep. 2014 14:15 - 16:00, B62, NH Abels hus

Fredrik Meyer, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties II

Tid og sted: 29. aug. 2014 10:15 - 11:00, B1036, NHA

Parabolic optimal control problems with pointwise controls

Tid og sted: 28. aug. 2014 14:15 - 16:00, B62, NH Abels hus

Arvid Siqveland, Høgskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties I