Results 81 to 90 of about 8,913,878 (219)

Null projections and noncommutative function theory in operator algebras

Journal of the London Mathematical Society, Volume 114, Issue 1, July 2026.
Abstract We study projections in the bidual of a C∗$\mathrm{C}^*$‐algebra B$B$ that are null with respect to a subalgebra A$A$, that is, projections p∈B∗∗$p\in B^{**}$ satisfying |φ|(p)=0$|\varphi |(p)=0$ for every φ∈B∗$\varphi \in B^*$ annihilating A$A$. In the separable case, A$A$‐null projections are precisely the peak projections in the bidual of A$
David P. Blecher, Raphaël Clouâtre
wiley   +1 more source

The Riesz potential in generalized Orlicz spaces [PDF]

, 2017
In this article we prove a Riesz potential estimate and a Sobolev inequality for general generalized Orlicz spaces. Our assumptions are natural generalizations of the log-Hölder continuity that is commonly used in the variable exponent case.
Hästö, Peter, Harjulehto, Petteri
core   +1 more source

A Characterization of Riesz Potential and Its Commutator in Local Complementary Generalized Orlicz–Morrey Spaces

Journal of Function Spaces
In this paper, we find sufficient conditions on functions ω1,ω2 which ensure the boundedness of Riesz potentials and their commutators with BMO functions from one local complementary generalized Orlicz–Morrey spaces M ∁Φ,ω1x0ℝn to the spaces M ∁Ψ,ω2x0ℝn.
Canay Aykol, Javanshir J. Hasanov, Ayhan Serbetci   +2 more
doaj   +1 more source

A Continuity Theorem for Generalized Riesz Potentials

Journal of Mathematical Analysis and Applications, 1994
Let \(0< \alpha< n\), \(1/r< 1-{\alpha \over n}\) and let \(k\in L^r (S_{n-1})\), where \(S_{n-1}\) is the unit sphere in \(\mathbb{R}^n\). The generalized Riesz kernel \(K_\alpha\) is given by \(K_\alpha (x)= k ({x\over {|x|}} )|x|^{\alpha -n}\), \(x\in \mathbb{R}^n- \{0\}\).
openaire   +1 more source

A general theory of inverse welfare functions

Theoretical Economics, Volume 21, Issue 3, Page 973-1018, July 2026.
This paper develops a general theory to recover the inverse welfare function that rationalizes a given tax schedule as optimal. Our theory allows for complex environments including the presence of multidimensional tax schedules, bunching/jumping behavior, optimization frictions, general equilibrium effects, and externalities.
Katy Bergstrom, William Dodds
wiley   +1 more source

Advanced control of non‐isothermal axial dispersion tubular reactors with recycle‐induced state delay

The Canadian Journal of Chemical Engineering, Volume 104, Issue 6, Page 3018-3037, June 2026.
Abstract We develop a delay‐aware estimation and control framework for a non‐isothermal axial dispersion tubular reactor modelled as a coupled parabolic‐hyperbolic PDE system with recycle‐induced state delay. The infinite‐dimensional dynamics are preserved without spatial discretization by representing the delay as a transport PDE and adopting a late ...
Behrad Moadeli, Stevan Dubljevic
wiley   +1 more source

Riesz potentials, higher Riesz transforms and Beppo Levi spaces

Hiroshima Mathematical Journal, 1988
The main center of investigations in this paper originates from the representation of the solution of the equation \[ \Delta^ \ell u=f, \quad \ell=1,2,\dots,\text{ with } f\in L_ p(\mathbb{R}^ n), \quad p>1.\tag{1} \] It is connected with the representation of functions from the space \({\mathcal L}_ m^ p=\{u\in{\mathcal D}'\): \(D^ \alpha u\in L_ p\),
openaire   +3 more sources

Hardy-Littlewood-Sobolev Inequalities on p-Adic Central Morrey Spaces

Journal of Function Spaces, 2015
We establish the Hardy-Littlewood-Sobolev inequalities on p-adic central Morrey spaces. Furthermore, we obtain the λ-central BMO estimates for commutators of p-adic Riesz potential on p-adic central Morrey spaces.
Qing Yan Wu, Zun Wei Fu
doaj   +1 more source

Variation in the Oxidative State of Collared Flycatcher (Ficedula albicollis) Nestlings and Its Association With Their Plumage Coloration

Ecology and Evolution, Volume 16, Issue 6, June 2026.
Plumage coloration is widely recognized as an important component in intraspecific communication. Our aim was to examine the variation of oxidative parameters and their associations with the coloration of two different nestling plumage traits in collared flycatchers (Ficedula albicollis).
Gabriella Kőmüves, Miklós Laczi, Fanni Sarkadi, Gyula Szabó, János Török, Gergely Hegyi   +5 more
wiley   +1 more source

Evans potentials and the Riesz decomposition

Hiroshima Mathematical Journal, 2008
This paper is concerned with Riesz-type decomposition for superharmonic functions in parabolic manifolds. The main result of the paper provides a necessary and sufficient condition for such a decomposition in terms of the spherical mean induced by the Evans kernels.
openaire   +2 more sources