Results 51 to 60 of about 874 (127)

Local spectral theory for subordinated operators: The Cesàro operator and beyond

Journal of the London Mathematical Society, Volume 112, Issue 2, August 2025.
Abstract We study local spectral properties for subordinated operators arising from C0$C_0$‐semigroups. Specifically, if T=(Tt)t⩾0$\mathcal {T}=(T_t)_{t\geqslant 0}$ is a C0$C_0$‐semigroup acting boundedly on a complex Banach space and Hν=∫0∞Ttdν(t)$$\begin{equation*} \mathcal {H}_\nu = \int _{0}^{\infty } T_t\; d\nu (t) \end{equation*}$$is the ...
Eva A. Gallardo‐Gutiérrez, F. Javier González‐Doña   +1 more
wiley   +1 more source

Summability factors between the absolute Cesàro methods

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2018
If Σε_{n}x_{n} is summable by the method Y whenever Σx_{n} is summable by the method X, then we say that the factor ε=(ε_{n}) is of type (X,Y) and denote by (X,Y).
G. Canan Hazar Güleç
doaj   +1 more source

Characterizations of a Banach Space through the Strong Lacunary and the Lacunary Statistical Summabilities

Mathematics, 2020
In this manuscript we characterize the completeness of a normed space through the strong lacunary ( N θ ) and lacunary statistical convergence ( S θ ) of series. A new characterization of weakly unconditionally Cauchy series through N θ
Soledad Moreno-Pulido, Giuseppina Barbieri, Fernando León-Saavedra, Francisco Javier Pérez-Fernández, Antonio Sala-Pérez   +4 more
doaj   +1 more source

Recovering discrete delayed fractional equations from trajectories

Mathematical Methods in the Applied Sciences, Volume 48, Issue 7, Page 7630-7640, 15 May 2025.
We show how machine learning methods can unveil the fractional and delayed nature of discrete dynamical systems. In particular, we study the case of the fractional delayed logistic map. We show that given a trajectory, we can detect if it has some delay effect or not and also to characterize the fractional component of the underlying generation model.
J. Alberto Conejero, Òscar Garibo‐i‐Orts, Carlos Lizama   +2 more
wiley   +1 more source

Economic and Social Impacts of Olive Quick Decline Syndrome: Analysing Data From the Italian Farm Accountancy Network

Plant Pathology, Volume 74, Issue 4, Page 1010-1023, May 2025.
Research on FADN farms shows that Xylella fastidiosa subsp. pauca in Salento (southern Italy) caused an economic loss of €132 million and reduced 1,050,000 working hours at olive farms level. ABSTRACT The rapid spread of Xylella fastidiosa subsp. pauca (Xfp) in the Salento area (Apulia region, southern Italy) has caused extensive socio‐economic damage ...
Federica Calderoni, Alessandro Petrontino, Michel Frem, Vincenzo Fucilli, Francesco Bozzo   +4 more
wiley   +1 more source

Spectral action beyond the weak-field approximation

, 2012
The spectral action for a non-compact commutative spectral triple is computed covariantly in a gauge perturbation up to order 2 in full generality. In the ultraviolet regime, $p\to\infty$, the action decays as $1/p^4$ in any even dimension.Comment: 17 ...
A. Carey, A. Chamseddine, A. Chamseddine, A. Chamseddine, A. Chamseddine, A. Pushnitski, A.A. Andrianov, A.O. Barvinsky, A.O. Barvinsky, A.O. Barvinsky, A.O. Barvinsky, B. Iochum, C. Levy, D. Vassilevich, D.R. Yafaev, D.R. Yafaev, D.V. Vassilevich, E. Buzano, R. Estrada, V. Gayral, V. Gayral, W.D. Suijlekom van   +21 more
core   +3 more sources

Substitutions on compact alphabets

Journal of the London Mathematical Society, Volume 111, Issue 3, March 2025.
Abstract We develop a systematic approach to continuous substitutions on compact Hausdorff alphabets. Focussing on implications of irreducibility and primitivity, we highlight important features of the topological dynamics of their (generalised) subshifts.
Neil Mañibo, Dan Rust, James J. Walton
wiley   +1 more source

On Divergence of Fourier Series by Some Methods of Summability

Journal of Function Spaces and Applications, 2012
A new summability method of series is introduced and studied. The particular cases of this method are, for example, variable-order Cesaro and Riesz methods. Applications to divergence problem of Fourier series are given.
Shakro Tetunashvili
doaj   +1 more source

I-Cesàro summability of sequences of sets [PDF]

, 2017
In this paper, we defined concept of Wijsman I-Cesàro summability for sequences of sets and investigate the relationships between the concepts of Wijsman strongly I-Cesàro summability, Wijsman strongly I-lacunary summability, Wijsman p-strongly I-Cesàro ...
Kişi, Ömer, Ulusu, Uğur
core  

Ergodic averages along sequences of slow growth

Journal of the London Mathematical Society, Volume 111, Issue 3, March 2025.
Abstract We consider pointwise almost everywhere convergence of weighted ergodic averages along the sequence Ω(n)$ \Omega (n)$, where Ω(n)$ \Omega (n)$ denotes the number of prime factors of n$ n$ counted with multiplicities. It was previously shown that a pointwise ergodic theorem for L∞$L^\infty$ functions does not hold along Ω(n)$ \Omega (n)$.
Kaitlyn Loyd, Sovanlal Mondal
wiley   +1 more source