Results 41 to 50 of about 244 (149)
Classification of limits of upper triangular matrix algebras. [PDF]
, 1993 Let Tn be the operator algebra of upper triangular n × n complex matrices. Three families of limit algebras of the form lim (Tnk) are classified up to isometric algebra isomorphism: (i) the limit algebras arising when the embeddings Tnk→Tnk+1, are ...
Hopenwasser, A. L., Power, Stephen C.
core
Actions on classifiable C*‐algebras without equivariant property (SI)
Bulletin of the London Mathematical Society, Volume 56, Issue 12, Page 3623-3633, December 2024.Abstract We exhibit examples of actions of countable discrete groups on both simple and non‐simple nuclear stably finite C*‐algebras that are tracially amenable but not amenable. We furthermore obtain that, under the additional assumption of strict comparison, amenability is equivalent to tracial amenability plus the equivariant analogue of Matui–Sato ...
Eusebio Gardella +2 more
wiley +1 more source
Period two automorphisms of UHF C∗-algebras
Journal of Functional Analysis, 1982 Recently [7] Fack and Marechal classified the product symmetries of a UHF C*-algebra. Among these product symmetries there is a distinguished element si, whose fixed point algebra is UHF. (Since they dealt with product symmetries all fixed point algebras are automatically AF.) The symmetry s: is characterized, among product symmetries, by the property ...
Herman, Richard H, Jones, Vaughan F.R
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Calculating Radio Emissions of Positive Streamer Phenomena Using 3D Simulations
Journal of Geophysical Research: Atmospheres, Volume 129, Issue 20, 28 October 2024.Abstract We study radio emissions from positive streamers in air using 3D simulations, from which the radiated electric field is computed by solving Jefimenko’s equations. The simulations are performed at 0.5bar $0.5\,\mathrm{b}\mathrm{a}\mathrm{r}$ using two photoionization methods: the Helmholtz approximation for a photon density and a Monte Carlo ...
Hemaditya Malla +7 more
wiley +1 more source
Engineering Reports, Volume 1, Issue 5, December 2019., 2019 This research describes signal processing techniques useful to highlight and contrast enhance human brain vessels detected with magnetic resonance imaging (MRI). The signal is here represented as multiplication between image intensity and the sum of second‐order partial derivatives of the model function fitted to MRI data. The implication of this novel
Carlo Ciulla
wiley +1 more source
NMR in Biomedicine, Volume 37, Issue 7, July 2024.Open‐source practices and resources in MRI have increased substantially in recent years. These advancements have fostered a culture of sharing and establishing nonexclusive global collaborations, leading to improved reproducibility and reusability of code and devices. Abstract Open‐source practices and resources in magnetic resonance imaging (MRI) have
Lukas Winter +7 more
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Ground States for Generalized Gauge Actions on UHF Algebras [PDF]
Communications in Mathematical Physics, 2021 Improved exposition and added a section on KMS-infinity ...
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Strongly outer group actions on UHF algebras
, 2018 We show that for any countable discrete maximally almost periodic group [Formula: see text] and any UHF algebra [Formula: see text], there exists a strongly outer product type action [Formula: see text] of [Formula: see text] on [Formula: see text ...
Michael Sun
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STATE EXTENSIONS OF STATES ON UHFnALGEBRA TO CUNTZ ALGEBRA [PDF]
Bulletin of the Korean Mathematical Society, 2002 Summary: Let \(\eta= \{\eta_m\}_m\) be an eventually constant sequence of unit vectors \(\eta_m\) in \(\mathbb{C}^n\) and let \(\rho_\eta\) be the pure state on UHF\(_n\) algebra which is defined by \(\rho_\eta (v_{i_1}, \cdots, v_{i_k}v^*_{j_k} \cdots v^*_{j_1})= \overline {\eta_1^{i_1} \cdots \eta_k^{i_k}} \eta_k^{j_k} \cdots\eta_1^{j_1}\).
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Classification of uniformly outer actions of Z2 on UHF algebras
, 2008 We give a complete classification up to cocycle conjugacy of uniformly outer actions of Z2 on UHF algebras. In particular, it is shown that any two uniformly outer actions of Z2 on a UHF algebra of infinite type are cocycle conjugate.
Matui, Hiroki, Katsura, Takeshi
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