## Visiting address

Ullevål StadionSognsveien 77B

0855 OSLO

Norway

Time and place:
Feb. 5, 2015 1:00 PM - 3:00 PM,
Undervisningsrom 126 Niels Henrik Abels hus

Her er innledning

Time and place:
Feb. 3, 2015 2:15 PM,
rom 107, N.H. Abels hus

Helge Brunborg (Statistisk sentralbyrå) holder et seminar i rom 107, 1. etasje N.H. Abels Hus kl. 14:15 tirsdag 3. februar: Hva skjer med verdens befolkningsutvikling?

Time and place:
Jan. 29, 2015 2:15 PM -
Jan. 29, 2014 4:00 PM,
B62, NH Abels hus

Helge Maakestad gives the Seminar in Algebra and Algebraic Geometry:

Generalized enveloping algebras, connections and characteristic classes

Time and place:
Jan. 22, 2015 2:15 PM -
Jan. 22, 2014 4:00 PM,
B62, NH Abels hus

Jan O. Kleppe, HiOA, gives the Seminar in Algebra and Algebraic Geometry:

On the Hilbert scheme of space curves

Time and place:
Jan. 16, 2015 12:15 PM,
Aud. 5 Vilhelm Bjerknes' hus

M. Sc. Krzysztof Jarosław Paczka ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.:

*Stochastic calculus and optimal control under model uncertainty*

Time and place:
Jan. 16, 2015 9:45 AM,
Aud. 5 Vilhelm Bjerknes' hus

M.Sc. Krzysztof Jarosław Paczka ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "The Skorohod embedding problem and applications in finance".

Time and place:
Jan. 8, 2015 2:15 PM -
Jan. 8, 2014 4:00 PM,
B62, NH Abels hus

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

Abelian varieties XV: Abelian varieties are quotients of Jacobian varieties

Time and place:
Dec. 18, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

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

Abelian varieties XIV: Hodge-formodningen for abelske varieteter.

Time and place:
Dec. 18, 2014 12:15 PM - 2:00 PM,
B62, NH Abels hus

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

Projektive grenser av spline systemer

Time and place:
Dec. 12, 2014 2:00 PM - 3:00 PM,
Aud 4 VB

Abstract: Soliton equations are an important class of nonlinear partial differential equations, which contain physically relevant equations like the Korteweg-de Vries (KdV) equation, the sine-Gordon equation, and the Nonlinear Schrödinger equation. While these equations govern very different physical phenomena, they have striking common structural properties like the existence of particle-like solutions (solitons) interacting in elastic collisions. The struggle to find a mathematical explanation has led to substantial progress in mathematical physics. Today it is known that the theory of soliton equations is linked to several major branches of mathematics. Our talk will be an introduction to an operator theoretic approach to soliton equations, which may be traced back to work of Marchenkov and enables us to apply Banach geometry in the study of solution families. As a motivation, we will carefully explain this in the most accessible case of the KdV equation. Then we will discuss further developments of the method in the study of matrix equations and hierarchies. In the applications part, we will talk on the asymptotic description of multiple pole solutions, the construction of matrix solitons and countable nonlinear superposition. We will illustrate our results by Mathematica plots.

Coffee/tea and cookies will be served from 13.30 to 13.55 in the rest area, 7th floor, NHA.

Time and place:
Dec. 11, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

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

Abelian varieties XIII

Time and place:
Dec. 11, 2014 9:15 AM - 10:00 AM,
B1036, 10th floor, NHA

AFEM in 3-D and beyond

Time and place:
Dec. 10, 2014 1:15 PM,
Aud. 4 Vilhelm Bjerknes' hus

M.Sc. Erika Kristina Lindstrøm ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.: Experimental work related to tsunami research, conducted in 2D small scale and 3D large scale facilities

Time and place:
Dec. 10, 2014 10:15 AM,
Aud. 4 Vilhelm Bjerknes' hus

M.Sc. Erika Kristina Lindstrøm ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "Advances in tsunami hydrodynamic research in the decade since 2004 Indian Ocean event".

Time and place:
Dec. 8, 2014 12:00 PM -
Dec. 11, 2014 9:00 AM,
Lysebu (Oslo)

Supported by the Foundation for Danish-Norwegian cooperation.

Time and place:
Dec. 4, 2014 2:15 PM - 4:00 PM,
NHA B637

Christian Voigt (Glasgow) will give a talk with title: The structure of quantum permutation groups

Abstract: Quantum permutation groups, introduced by Wang, are a quantum analogue of permutation groups. These quantum groups have a surprisingly rich structure, and they appear naturally in a variety of contexts, including combinatorics, operator algebras, and free probability. In this talk I will give an introduction to these quantum groups, and review some results on their structure. I will then present a computation of the K-groups of the C*-algebras associated with quantum permutation groups, relying on methods from the Baum-Connes conjecture.

Time and place:
Dec. 4, 2014 9:15 AM - 10:00 AM,
B1036, 10th floor, NHA

Adaptive finite elements: practice and implementation

Time and place:
Dec. 3, 2014 2:00 PM - 4:00 PM,
NHA B71

Alfons van Daele, University of Leuven (Belgium), will give a talk with title: Separability idempotents and quantum groupoids

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

Andrea Riebler ( Dept. of math., NTNU) gives a seminar in room 107, 1st floor N.H. Abels House at 15:15 December 2nd: Projecting the future burden of cancer: Bayesian APC analysis made simple.

Time and place:
Dec. 2, 2014 1:00 PM - 3:15 PM,
room 3315 Kristine Bonnevie’s house (Biology)

Time and place:
Dec. 1, 2014 10:15 AM - 12:00 PM,
B 62 NHA

Modular forms are certain complex-analytic functions on the upper-half plane. They can also be interpreted as giving linear-algebraic invariants of elliptic curves, perhaps equipped with some extra structure, and in this way they reveal their algebraic-geometric nature. One of the most fundamental modular forms is the Dedekind eta function. However, it seems that only recently has it been pinned down precisely what extra structure on an elliptic curve is needed to define eta. Namely, Deligne was able to express this extra structure in terms of the 2- and 3-power torsion of the elliptic curve. Deligne's proof, apparently, is computational. In this talk I'll describe a conjectural reinterpretation of Deligne's result, together with some supporting results and a hint at a possible conceptual proof. The reinterpretation is homotopy theoretic, the key being to think of an elliptic curve as giving a class in framed cobordism. This directly connects the number "24" which often appears in the study of eta to the 3rd stable stem in topology.

Time and place:
Nov. 27, 2014 2:15 PM - 4:00 PM,
B62, NH Abels hus

Johannes Kleppe, Høgskolen i Buskerud og Vestfold, gives the Seminar in Algebra and Algebraic Geometry:

Abelian varieties XII

Time and place:
Nov. 20, 2014 2:15 PM - 4:00 PM,
B1036 NHA

I will discuss joint work in progress with David Gepner, computing the ring of endomorphisms of the equivariant motivic sphere spectrum, for a finite group. The result is a combination of the endomorphism ring of the equivariant topological sphere spectrum (which equals the Burnside ring by a result of Segal) and that of the motivic sphere spectrum (which equals the Grothendieck-Witt ring of quadratic forms by a result of Morel). This computation is a corollary of a tom Dieck style splitting for certain equivariant motivic homotopy groups.

Time and place:
Nov. 20, 2014 1:15 PM,
Aud. 2 Vilhelm Bjerknes' hus

M. Sc. Marcus Karl Viren Eriksson ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.:

*Valuation of Energy Derivatives: A Stochastic Control Approach*

Time and place:
Nov. 20, 2014 10:15 AM,
Aud. 2, Vilhelm Bjerknes' hus

M.Sc. Marcus Karl Viren Eriksson ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "Theory and application of LSS and CARMA processes".