All seminars during 2004.


For questions about this page, contact Nadia S. Larsen.


  • Wednesday January 21, 2004, 14:15 - 16:00 in B62.

    Ph.D. student Sindre Duedahl, University of Oslo:

    Foredrag omkring Exel's artikel "A new look at the crossed product of a C*-algebra by an endomorphism".


  • Thursday February 5, 2004, 12:15 - 14:00 in B71.

    Professor Ola Bratteli, University of Oslo:

    Informal colloquim on Chapter 1 of O. Bratteli, P. E. T. Jørgensen and V. Ostrovskii, Representation theory and numerical AF-invariants: The representations and centralizers of certain states on O_d, Mem. Amer. Math Soc. 168 (2004), no. 797.


  • Wednesday February 11, 2004, 14:15 - 16:00 in B62.

    Ph.D. student Sindre Duedahl fortsetter den uformelle gjennomgang av

    Kapitel 1 i O. Bratteli, P. E. T. Jørgensen and V. Ostrovskii, Representation theory and numerical AF-invariants: The representations and centralizers of certain states on O_d, Mem. Amer. Math Soc. 168 (2004), no. 797.


  • Wednesday February 18, 2004, 14:15 - 16:00 in B71.

    Ph.D. student Sindre Duedahl fortsetter den uformelle gjennomgang av

    Kapitel 1 i O. Bratteli, P. E. T. Jørgensen and V. Ostrovskii, Representation theory and numerical AF-invariants: The representations and centralizers of certain states on O_d, Mem. Amer. Math Soc. 168 (2004), no. 797.


  • Wednesday February 25, 2004, 14:15 - 16:00 in B71.

    Ph.D. student Sindre Duedahl fortsetter den uformelle gjennomgang av

    Kapitel 1 i O. Bratteli, P. E. T. Jørgensen and V. Ostrovskii, Representation theory and numerical AF-invariants: The representations and centralizers of certain states on O_d, Mem. Amer. Math Soc. 168 (2004), no. 797.


  • Wednesday March 3, 2004, 14:15 - 16:00 in B71.

    Postdoc Sergey Neshveyev, University of Oslo:

    Boundaries of quantum random walks.


  • Wednesday March 10, 2004, 14:15 - 16:00 in B71.

    Postdoc Sergey Neshveyev, University of Oslo, continues his talk on:

    Boundaries of quantum random walks.


  • Wednesday March 17, 2004, 14:15 - 16:00 in B71.

    Postdoc Sergey Neshveyev, University of Oslo, will finish the computation of the boundary of SU_q(n).

  • Tuesday March 30, 2004, 10:15 - 12:00 in B62.

    Ph.D. student Sindre Duedahl, University of Oslo:

    fortsetter den uformelle gjennomgang av Kapitel 1 i O. Bratteli, P. E. T. Jørgensen and V. Ostrovskii, Representation theory and numerical AF-invariants: The representations and centralizers of certain states on O_d, Mem. Amer. Math Soc. 168 (2004), no. 797,

    og av Palle E. T. Jorgensen, Measures in wavelet decompositions.


  • Wednesday March 31, 2004, 14:15 - 16:00 in B62.

    Professor Magnus Landstad, NTNU, will talk on:

    Convolution, multiplication and finite rank operators.

    Abstract: If G is a locally compact group, it is well known that the product of a multiplication operator and a convolution operator on L^2(G) is a compact operator. We shall first look at when such a product is of finite rank and then study when two such operators commute. Then we shall look at applications to the multiplier Hopf algebras studied by A. Van Daele and see that all these questions have the same answer.


  • Wednesday April 14, 2004, 14:15 - 16:00 in B71.

    Ph.D. student Sindre Duedahl, University of Oslo, resumes his working seminar on Palle E. T. Jorgensen's paper, Measures in wavelet decompositions.


  • Wednesday April 28, 2004, 14:15 - 16:00 in B71.

    Sergey Neshveyev and Nadia S. Larsen will start a series of talks in which they will go through the paper

    Alain Connes and Matilde Marcolli, "From pysics to number theory via noncommutative geometry. Part I: Quantum statistical mechanics of Q-lattices"
    .

    Click here to get the paper from the Mathematics ArXiv.

    Nadia S. Larsen, University of Oslo, will start gently with a background talk:

    Abstract: The Connes-Marcolli paper generalises remarkable results by Bost and Connes. We present an overview over the work by various authors on the Bost-Connes algebra, and explain the challenges which appear when trying to generalise the Bost-Connes results.


  • Thursday April 29, 2004, 13:15 - 14:00 in B71.

    Professor Hsiang-Ping Huang, National Tsing Hua University, Taiwan:

    Powers' shifts and their applications.


  • Wednesday May 5, 2004, 14:15 - 16:00 in B71.

    Sergey Neshveyev will continue the working seminar centered around the paper

    Alain Connes and Matilde Marcolli, "From pysics to number theory via noncommutative geometry. Part I: Quantum statistical mechanics of Q-lattices."

    Click here to get the paper from the Mathematics ArXiv.


  • Wednesday May 12, 2004, 14:15 - 16:00 in B71.

    Sergey Neshveyev will continue the working seminar centered around the paper

    Alain Connes and Matilde Marcolli, "From pysics to number theory via noncommutative geometry. Part I: Quantum statistical mechanics of Q-lattices."


  • Wednesday June 2, 2004, 14:15 - 16:00 in B71.

    Holger Reich, University of Munster:

    The Farrell-Jones Conjecture implies one third of the Atiyah Conjecture.


  • Wednesday June 9, 2004, 14:15 - 16:00 in B81.

    Palle Jørgensen, University of Iowa:

    Fractal Components of Wavelet Measures

    Abstract: The basic structure underlying wavelets is a discrete, n-adic version of the ax + b group. The standard approach, based on quadrature mirror filters (representations of O_n) and multiresolutions corresponds to the selection of just one path in a certain combinatorial pyramid. Other choices are dictated by wavelet measures, and go under the name wavelet packets. We study the fractal scales of wavelet measures.


  • Monday June 14, 2004, 10:15 - 11:00 in B71.

    Tuong Tong Tat, University of Iowa:

    Casimir invariant differential operators of a class of infinite-dimensional Lie groups.


  • Tuesday June 15, 2004, 14:15 - 16:00 in B63.

    Iain Raeburn, University of Newcastle, Australia:

    Higher-rank graphs and their $C^*$-algebras.


  • Wednesday June 16, 2004, 14:15 - 16:00 in B71.

    Louis Labuchagne, UNISA, Pretoria, South Africa:

    On noncommutative L^p spaces.


  • Wednesday June 23, 2004, 14:15 - 16:00 in B71.

    Marcelo Laca, University of Victoria, Canada:

    Phase transitions on Hecke C*-algebras.


  • Wednesday September 15, 2004, 14:15 - 16:00 in B71.

    Professor Akitaka Kishimoto, Hokkaido University, Sapporo:

    Approximate AF flows


  • Wednesday September 29, 2004, 14:15 - 16:00 in B71.

    Sergey Neshveyev, UIO:

    Working seminar with the aim of going through the paper "From physics to number theory via noncommutative geometry" by A. Connes and M. Marcolli. You can get the paper here.


  • Wednesday October 6, 2004, 14:15 - 16:00 in B71.

    Nadia S. Larsen, UIO:

    We continue our working seminar based on the paper "From physics to number theory via noncommutative geometry" by A. Connes and M. Marcolli. You can get the paper here.


  • Wednesday October 13, 2004, 14:15 - 16:00 in B71.

    Nadia S. Larsen, UIO:

    We continue our working seminar based on the paper "From physics to number theory via noncommutative geometry" by A. Connes and M. Marcolli. You can get the paper here.


  • Wednesday October 27, 2004, 14:15 - 16:00 in B71.

    Ph.D. student Kjetil Roysland, UIO:

    Modulstruktur for gitterinvariante underrom i L^2(R^n).


  • Wednesday November 3, 2004, 14:15 - 16:00 in B71.

    Ph.D. student Kjetil Roysland, UIO:

    Modulstruktur for gitterinvariante underrom i L^2(R^n).

  • Wednesday November 10, 2004, 14:15 - 16:00 in B71.

    Sergey Neshveyev, UIO, will continue the working seminar based on the paper

    "From physics to number theory via noncommutative geometry" by A. Connes and M. Marcolli. You can get the paper here.


  • Wednesday November 17, 2004, 14:15 - 16:00 in B71.

    Arnoud Jacobs, University of Leuven, Belgien:

    Multiplicative unitaries and Haar weights

    Abstract: We discuss the use of multiplicative unitaries in quantum group theory. In particular, we show how they can be very helpful in the construction of examples. We introduce a new technique to construct the Haar weights and we apply this technique in the concrete case of the quantum E(2) group.


  • Wednesday November 24, 2004, 14:15 - 16:00 in B71.

    Marcelo Laca, University of Victoria, Canada:

    More simple C*-algebras generated by isometries

    Abstract: I will talk about some simple C*-algebras arising as boundary quotients of the Toeplitz C*- algebras of generalized Artin braid groups of rectangular type. This is joint work with J. Crisp (Dijon).


  • Wednesday December 1, 2004, 14:15 - 16:00 in B71.

    Masamichi Takesaki, UCLA, NTNU, Sendai:

    The Intrinsic Core and The Characteristic Square of a Factor.