Tidligere gjesteforelesninger og seminarer - Side 55

Nicolai Stammeier (Münster) will give a talk with title "Aiming for accuracy - boundary quotients of right LCM semigroups revisited "

Abstract: I will recall the notions of foundation sets and the boundary quotient for right LCM semigroups. This C*-algebra is obtained by modding out products of defect projections over foundation sets in the full semigroup C*-algebra of the right LCM semigroup. Observing that this is in stark contrast to the standard presentations of C*-algebras in the spirit of Cuntz algebras, where a summation relation gets used, we will discuss the possibility of replacing the product relation by a summation relation and arrive at the accurate refinement property. This feature turns out to be quite common among right LCM semigroups. In fact, we are yet to see an example of a right LCM semigroup that has an insufficient supply of accurate foundation sets. Time permitting, we will leave the realm of right LCM semigroups for the sake of finding semigroups without the accurate refinement property.

James Armitage, University of Toronto, Canada.

Karen Kidd, Canadian Rivers Institute & Biology Department, University of New Brunswick, Saint John, New Brunswick, Canada

 

 

Valeria Vitelli (Dept. of Biostatistics, UiO) will give a seminar in room 801 (B81), 8th floor N.H. Abels House at 14:15  September 1st: Probabilistic preference learning with the Mallows rank model

Simon Johnston, Head of Astrophysics at the Australian Telescope National Facility

Felipe Rincon, UiO, gives the Seminar in Algebra and Algebraic Geometry

An introduction to tropical geometry

The seminar will be at the same time and location as during the spring.

Andrey Pilipenko (Ukrainian National Academy of Sciences) gives a lecture with the title: Limits of Markov processes with irregular behavior at a fixed point.

It is a great pleasure to invite you to attend a seminar by Professor Jean Rossier from INSERM, France. Dr. Rossier has made several major discoveries in neuropharmacology including his work on neuropeptides with Bloom, Guillemin, and Udenfriend. He discovered multiple opioïd peptides delineating several distinct neuronal systems involved in pain and reward. Turning his interests on GABAA receptors, he made the seminal observation that several inverse agonists facilitate performance in learning and memory tasks. This has led to the present development by the pharmaceutical industry of specific inverse agonists which are candidates for promnesic drugs. His most widely technical contribution in neuroscience is the invention of single cell RT-PCR after patch-clamp. This unexpected marriage of molecular biology and physiology led to several discoveries. With single cell RT-PCR, he has deciphered the molecular organization of various synaptic receptors. He is now using RT-PCR and a multidisciplinary approach combining electrophysiology, pharmacology and imaging to characterize the diversity of neocortical interneurons and their roles in local blood flow control.

Klaus Thomsen, Aarhus Universitet, Denmark, will give a talk with title "KMS states and ground states for generalized gauge actions on graph C*-algebras"

Guest lecture by Professor Ari Koskinen from Aalto University in Helsinki.

John Quigg, Arizona State University at Tempe, USA, will give a talk with title: Landstad duality and a theorem of Pedersen

Abstract:

In joint work with Steve Kaliszewski and Tron Omland, we show how a theorem of Pedersen characterizing exterior equivalent actions on a C*-algebra can be parlayed into an equivalence between two equivariant categories of C*-algebras. In one category, isomorphisms correspond to outer conjugacies of actions, while isomorphisms in the other category are equivariant isomorphisms of the crossed products that respect the generalized fixed point algebras. This category equivalence is a variation of Landstad's original characterization of actions up to equivariant isomorphism, where we now allow more morphisms. Time permitting, we will compare our "outer duality" with Landstad duality and also with Imai-Takai crossed-product duality.

 

 

Alfons van Daele (University of Leuven, Belgium) will give a talk with title:  Constructing locally compact quantum groups from pairs of *-algebras

Abstract: Let (A,\Delta)  be a finite-dimensional Hopf *-algebra. The dual B of A is again a finite-dimensional Hopf *-algebra. The entire structure of these two Hopf *-algebras is encoded in the *-algebras A and B and the pairing between the two. We will explain how this works. This is in fact true in many more, and more general situations.  In particular, we give an example constructed from a pair of subroups H,K of a group G with the property that the map (h,k)-> hk is a bijection from HxK to G. This method is used in a joined paper with Magnus Landstad where we construct a pair of locally compact quantum groups from such pairs of subgroups of a locally compact group G.

 

Friday seminar by Matthew Burgess from University of California, Santa Barbara  (US)

Sharon Hook, CSIRO​, Centre for Environmental Contaminants Research, Lucas Heights, NSW​, Australia

CIME, EVOGENE & CEES Friday Seminar by Volkhard Kempf from the University Hospital Frankfurt

The research centre for dark matter, The Strategic Dark Matter Initiative - SDI, will officially be launched on Friday, and invites you all to a popular science lecture, with coffee and snacks.

Filippo Vernizzi, CEA-Saclay - Paris

Computable error estimates for Monte Carlo finite element approximation of elliptic PDE with lognormal diffusion coefficients

Adam Sørensen (UiO) will give a talk with title "Leavitt path algebras - a connection between pure algebra and operator algebras"

Abstract: We will discuss Leavitt path algebras, the purely algebraic cousins of the analytic graph C*-algebras. We will discuss similarities and differences, in particular recent work with Brownlowe on a purely algebraic version of Kirchberg's theorem that all exact C*-algebras embed into O_2.

CEES Extra Seminar by Matthieu Barbier and Emily Klein from Princeton University. 

Stein Andreas Bethuelsen (Universiteit Leiden) gives a lecture with the title: Random walks in (dynamic) random environment

Marco Matassa (UiO) will give a talk with title The Dolbeault-Dirac operator on quantized projective spaces, revisited

Abstract: In this talk I will present a new construction for the Dolbeault-Dirac operator on quantum projective spaces, the main result being the computation of its square. This clarifies and generalizes some results of D'Andrea-Dąbrowski. Moreover it gives a class of explicit examples of the general construction of Krähmer-Tucker Simmons, which deals with such operators on irreducible generalized flag manifolds.

Frode Hansen, Professor, ITA