Visiting addressNiels Henrik Abels hus Moltke Moes vei 35 (map)
Pawel Kasprzak (Warzaw) will give a talk with title " Quantum actions on discrete quantum spaces"
To any action of a compact quantum group on a von Neumann algebra which is a direct sum of factors we associate an equivalence relation corresponding to the partition of a space into orbits of the action. We show that in case all factors are finite-dimensional (i.e. when the action is on a discrete quantum space) the relation has finite orbits. We then apply this
i) to generalize the classical theory of Clifford, concerning the restrictions of representations to normal subgroups, to the framework of quantum subgroups of discrete quantum groups, itself extending the context of closed normal quantum subgroups of compact quantum groups; ii) to the context of idempotent states showing that the algebra of invariant elements is finite dimensional if and only if the corresponding state is normal. Joint work with K. De Commer, A. Skalski and P. Sołtan.
Professor Emeritus Erling Størmer will turn 80 on November 2, and he will use this occasion to give a Colloquium Talk with tittle:
POSITIVE LINEAR MAPS ON MATRIX ALGEBRAS
Abstract: The first part of the talk will be an introduction to the theory of positive linear maps between matrix algebras, plus a few words on the operator algebra case. For the last 20 years, physicists working in quantum information theory have been active in the subject and I’ll devote the last half of the talk to a negative solution to a conjecture they had.
When and how surface structure determines the dynamics of partial wetting
I will discuss machine computations in a finite range, using Bruner's ext-program, of Ext over A, the mod 2 Steenrod algebra, and over A(2), the subalgebra of A generated by Sq^1, Sq^2 and Sq^4. These are the E_2-terms of the mod 2 Adams spectral sequences for S and tmf, respectively.
Sedimentation-diffusion equilibrium of Quincke rollers
Iceberg drift on dead water
Paul Arne Øsvær will talk about A1-contractible varieties in the Oberseminar on Arithmetische und Algebraische Geometrie, at the Mathematisches Institut der Universität München.
Erik Bedos (UiO) will give a talk with title "On Exel-Pardo algebras as Cuntz-Pimsner algebras"
Glen Wilson will hold an electronic seminar at the Electronic Computational Homotopy Theory Seminar run by Dan Isaksen.
Nicolai Stammeier (Oslo) will give a talk with title: The inner structure of boundary quotients of right LCM semigroups
Abstract: In joint work with Roberto Conti, Stefano Rossi, and Valeriano Aiello, we use semidirect products built from algebraic dynamical systems to model right LCM semigroups to study various structural aspects in connection with a selection of distinguished subalgebras of the associated boundary quotients. Our two guiding examples are integral dynamics as considered in work of Barlak - Omland - Stammeier, and exact injective group endomorphisms of discrete abelian groups with finite cokernel as studied by Cuntz and Vershik.
Glen Wilson will give a talk in the UiO Topology Seminar.
Eric Schaanning (Norges Bank) gives a lecture with the title: Interbank contagion and systemic risk: How robust are estimates?
M.Sc. Endre Joachim Mossige ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.:
Continuous Hydrodynamic Separation and Concentration of Particles according to Size by use of the Trilobite Technology
M.Sc. Endre Joachim Mossige ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "The physics behind a perfectly boiled egg".