Mathematics - Research News

On graph algebras from interval maps

 Mathematics - Research News
 19 April 2019
C. Correia Ramos, Nuno Martins, Paulo R. Pinto. Source: Annals of Functional Analysis, Volume 10, Number 2, 203--217.Abstract: We produce and study a family of representations of relative graph algebras on Hilbert spaces that arise from the orbits of points of $1$ -dimensional dynamical systems,...

Orthogonal complementing in Hilbert $C^{*}$ -modules

 Mathematics - Research News
 19 April 2019
Boris Guljaš. Source: Annals of Functional Analysis, Volume 10, Number 2, 196--202.Abstract: We characterize orthogonally complemented submodules in Hilbert $C^{*}$ -modules by their orthogonal closures. Applying Magajna’s characterization of Hilbert $C^{*}$ -modules over $C^{*}$ -algebras of...

G-frames and their generalized multipliers in Hilbert spaces

 Mathematics - Research News
 19 April 2019
Hessam Hosseinnezhad, Gholamreza Abbaspour Tabadkan, Asghar Rahimi. Source: Annals of Functional Analysis, Volume 10, Number 2, 180--195.Abstract: In this article, we introduce the concept of generalized multipliers for g-frames. In fact, we show that every generalized multiplier for g-Bessel...

Non-uniform dependence on initial data for equations of Whitham type

 Mathematics - Research News
 03 April 2019
Mathias Nikolai Arnesen. Source: Advances in Differential Equations, Volume 24, Number 5/6, 257--282.Abstract: We consider the Cauchy problem \[ \partial_t u+u\partial_x u+L(\partial_x u) =0, \quad u(0,x)=u_0(x) \] for a class of Fourier multiplier operators $L$, and prove that the solution map...

Doubly stochastic operators with zero entropy

 Mathematics - Research News
 16 January 2019
Bartosz Frej, Dawid Huczek. Source: Annals of Functional Analysis, Volume 10, Number 1, 144--156.Abstract: We study doubly stochastic operators with zero entropy. We generalize three famous theorems: Rokhlin’s theorem on genericity of zero entropy, Kushnirenko’s theorem on equivalence of discrete...

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