Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Landstad, Magnus B."'
We prove that every coaction of a compact group on a finite-dimensional $C^*$-algebra is associated with a Fell bundle. Every coaction of a compact group on a matrix algebra is implemented by a unitary operator. A coaction of a compact group on $M_n$
Externí odkaz:
http://arxiv.org/abs/2406.16839
Autor:
Landstad, Magnus B., Van Daele, Alfons
Consider a locally compact group $G$ and a locally compact space $X$. A local right action of $G$ on $X$ is a continuous map $(x,p)\mapsto x\cdot p$ from an open subset $\Gamma$ of the Cartesian product $X\times G$ to $X$ satisfying certain obvious p
Externí odkaz:
http://arxiv.org/abs/2309.08319
Autor:
Landstad, Magnus B., Van Daele, Alfons
A finite quantum hypergroup is a finite-dimensional unital algebra $A$ over the field of complex numbers. There is a coproduct on $A$, a coassociative map from $A$ to $A\otimes A$ assumed to be unital, but it is not required to be an algebra homomorp
Externí odkaz:
http://arxiv.org/abs/2209.13282
We develop an approach, using what we call "tensor $D$ coaction functors", to the "$C$-crossed-product" functors of Baum, Guentner, and Willett. We prove that the tensor $D$ functors are exact, and identify the minimal such functor. This continues ou
Externí odkaz:
http://arxiv.org/abs/2108.09234
We give the beginnings of the development of a theory of what we call "R-coactions" of a locally compact group on a $C^*$-algebra. These are the coactions taking values in the maximal tensor product, as originally proposed by Raeburn. We show that th
Externí odkaz:
http://arxiv.org/abs/2108.09231
Autor:
Bratteli, Tone, Digernes, Trond, Elliott, George, Evans, David E., Jorgensen, Palle E., Kishimoto, Aki, Landstad, Magnus B., Robinson, Derek, Størmer, Erling
Publikováno v:
Notices Amer. Math. Soc. 67 (2020), no. 5, 665-675
This article discusses the life and work of Professor Ola Bratteli (1946--2015). Family, fellow students, his advisor, colleagues and coworkers review aspects of his life and his outstanding mathematical accomplishments.
Comment: 18 pages, 15 fi
Comment: 18 pages, 15 fi
Externí odkaz:
http://arxiv.org/abs/1903.01524
For a discrete group $G$, we develop a `$G$-balanced tensor product' of two coactions $(A,\delta)$ and $(B,\epsilon)$, which takes place on a certain subalgebra of the maximal tensor product $A\otimes_{\max} B$. Our motivation for this is that we are
Externí odkaz:
http://arxiv.org/abs/1812.01042
Publikováno v:
Pacific J. Math. 293 (2018) 301-339
In further study of the application of crossed-product functors to the Baum-Connes Conjecture, Buss, Echterhoff, and Willett introduced various other properties that crossed-product functors may have. Here we introduce and study analogues of these pr
Externí odkaz:
http://arxiv.org/abs/1701.02007
In a recent paper on exotic crossed products, we included a lemma concerning ideals of the Fourier-Stieltjes algebra. Buss, Echterhoff, and Willett have pointed out to us that our proof of this lemma contains an error. In fact, it remains an open que
Externí odkaz:
http://arxiv.org/abs/1606.06685
We prove that if E and F are large ideals of B(G) for which the associated coaction functors are exact, then the same is true for the intersection of E and F. We also give an example of a coaction functor whose restriction to the maximal coactions do
Externí odkaz:
http://arxiv.org/abs/1508.00284