Results 31 to 40 of about 685 (121)

On multiplicative recurrence along linear patterns

Journal of the London Mathematical Society, Volume 112, Issue 3, September 2025.
Abstract Donoso, Le, Moreira, and Sun (J. Anal. Math. 149 (2023), 719–761) study sets of recurrence for actions of the multiplicative semigroup (N,×)$(\mathbb {N}, \times)$ and provide some sufficient conditions for sets of the form S={(an+b)/(cn+d):n∈N}$S=\lbrace (an+b)/(cn+d) \colon n \in \mathbb {N}\rbrace $ to be sets of recurrence for such actions.
Dimitrios Charamaras, Andreas Mountakis, Konstantinos Tsinas   +2 more
wiley   +1 more source

Uniformly convex metric spaces

, 2014
In this paper the theory of uniformly convex metric spaces is developed. These spaces exhibit a generalized convexity of the metric from a fixed point.
Kell, Martin
core   +2 more sources

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

Perturbation Bounds for Quantum Markov Processes and their Fixed Points

, 2013
We investigate the stability of quantum Markov processes with respect to perturbations of their transition maps. In the first part, we introduce a condition number that measures the sensitivity of fixed points of a quantum channel to perturbations.
Szehr, Oleg, Wolf, Michael M.
core   +1 more source

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

Communicating Zero-Sum Product Stochastic Games

, 2019
We study two classes of zero-sum stochastic games with compact action sets and a finite product state space. These two classes assume a communication property on the state spaces of the players.
Garrec, Tristan
core   +3 more sources

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

A crucial active site network of titratable residues guides catalysis and NAD+ binding in human succinic semialdehyde dehydrogenase

Protein Science, Volume 34, Issue 1, January 2025.
Abstract Human succinic semialdehyde dehydrogenase is a mitochondrial enzyme fundamental in the neurotransmitter γ‐aminobutyric acid catabolism. It catalyzes the NAD+‐dependent oxidative degradation of its derivative, succinic semialdehyde, to succinic acid.
Samuele Cesaro, Marco Orlando, Ilaria Bettin, Carmen Longo, Giulia Spagnoli, Patrizia Polverino de Laureto, Gianluca Molla, Mariarita Bertoldi   +7 more
wiley   +1 more source

On Modulus Statistical Convergence in Partial Metric Spaces

Axioms
Modulus statistical convergence has been studied in very different general settings such as topological spaces and uniform spaces. In this manuscript, modulus statistical convergence is defined and studied in partial metric spaces.
Francisco Javier García-Pacheco, Ramazan Kama   +1 more
doaj   +1 more source

Bootstrapping non‐stationary and irregular time series using singular spectral analysis

Journal of Time Series Analysis, Volume 46, Issue 1, Page 81-112, January 2025.
This article investigates the consequences of using Singular Spectral Analysis (SSA) to construct a time series bootstrap. The bootstrap replications are obtained via a SSA decomposition obtained using rescaled trajectories (RT‐SSA), a procedure that is particularly useful in the analysis of time series that exhibit nonlinear, non‐stationary and ...
Don S. Poskitt
wiley   +1 more source