## Visiting address

Ullevål StadionSognsveien 77B

0855 OSLO

Norway

Time and place:
Mar. 12, 2015 10:15 AM - 12:00 PM,
Ole Johan Dahls hus, møterommet i etasje 9

Sam Sanders, Ghent and Munich, will give a lecture with the tittle

On the contingency of predicativism.

Time and place:
Mar. 11, 2015 2:15 PM - 4:00 PM,
NHA B71

Franz Luef (NTNU) will give a talk with title "Sigma-models solitons on noncommutative spaces"

Abstract: Results from time-frequency analysis and Gabor analysis allow the construction of new classes of sigma-model solitons over the Moyal plane and over noncommutative tori, taken as source spaces, with a target space made of two points. A natural action functional leads to self-duality equations for projections in the source algebra. Solutions, having non-trivial topological content, are constructed via suitable Morita duality bimodules. This is joint work with L. Dabrowski and G. Landi.

Time:
Mar. 10, 2015 2:15 PM

John Dagsvik ( Statistics Norway ) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 March 10th: How Does the Temperature Vary over Time? Evidence on the Stationary and Fractal Nature of Temperature Fluctuations

Time and place:
Mar. 4, 2015 2:15 PM - 4:00 PM,
NHA B735

Bartosz K. Kwaśniewski (University of Southern Denmark, Odense) will talk on: Topological aperiodicity for product systems of C*-correspondences

Abstract:We introduce a semigroup of multivalued maps dual to a product system of $C^*$-correspondences over an Ore semigroup. Under a certain aperiodicity condition on the dual semigroup we obtain a uniqueness theorem and a simplicity criterion for the associated Cuntz-Pimsner algebra. These results generalize similar statements for crossed products by groups (R. J. Archbold, J. S. Spielberg) and Exel’s crossed products (R. Exel, A. Vershik). They also give interesting conditions for topological higher rank graphs, and apply to the new Cuntz $C^*$-algebra $\mathcal{Q}_\mathbb{N}$ arising from the `$ax+b$'-semigroup over natural numbers. (Based on joint work with Wojciech Szymański.)

Time and place:
Feb. 27, 2015 1:15 PM,
Aud. 5 Vilhelm Bjerknes' hus

M. Sc. Sara Ana Solanilla Blanco ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.:

Stochastic modelling and pricing of energy and weather derivatives

Time and place:
Feb. 27, 2015 10:15 AM,
Aud. 5 Vilhelm Bjerknes' hus

M.Sc. Sara Ana Solanilla Blanco ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "Cumulative prospect theory and its applications in mathematical finance, portfolio management and derivatives pricing".

Time and place:
Feb. 26, 2015 2:15 PM - 4:00 PM,
B62, NH Abels hus

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

Modular curves I

Time and place:
Feb. 25, 2015 2:15 PM - 4:00 PM,
NHA B71

Adam P.W. Sørensen will talk on Nuclear dimension of UCT Kirchberg algebras

Abstract: Nuclear Dimension is a regularity property for C*-algebras that is based on the type of properties currently being taught in Topics in Operator Algebras. We will go over the definition and motivation and discuss known results.

Time:
Feb. 24, 2015 2:15 PM

Kasper Christensen ( Nofima, Ås and Aarhus university ) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 February 24th: Mining for new product ideas.

Time and place:
Feb. 18, 2015 2:15 PM - 3:15 PM,
NHA B735

Time and place:
Feb. 12, 2015 2:15 PM - 4:00 PM,
B62, NH Abels hus

Atanas Iliev, Seoul National University, gives the Seminar in Algebra and Algebraic Geometry:

Fano manifolds - old and new

Time and place:
Feb. 11, 2015 2:15 PM - 4:00 PM,
NHA B735

Makoto Yamashita, Ochanomizu University, will give a talk with title: Drinfeld center and representation theory for monoidal categories

Abstract: Motivated by the recently found relation between central completely positive multipliers and the spherical unitary representations of the Drinfeld double for discrete quantum groups, we construct and analyze the representations of fusion algebra of rigid C*-tensor category from the unitary half-braidings. Through the correspondence of Drinfeld center and the generalized Longo-Rehren construction in subfactor theory, these representations are also related to Popa’s theory of correspondences and subfactors. This talk is based on joint work with Sergey Neshveyev.

Time and place:
Feb. 10, 2015 2:15 PM,
Room 107, 1st floor N.H. Abels House

Håvard Rue ( Dept. of math., NTNU) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 February 10th: Penalising model component complexity: A principled practical approach to constructing priors

Time and place:
Feb. 6, 2015 1:15 PM,
Aud. 5 Vilhelm Bjerknes' hus

M.Sc. Qiao Jie Yang ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.:

*Semi-analytical models for predicting post-buckling response and ultimate strength of imperfect composite plates*

Time and place:
Feb. 6, 2015 10:15 AM,
Aud. 5 Vilhelm Bjerknes' hus

M.Sc. Qiao Jie Yang ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "Impulse loaded steel plated structure".

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. 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. 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.