Results 61 to 70 of about 5,144,504 (199)

Projection‐based estimators for matrix/tensor‐valued data

Scandinavian Journal of Statistics, Volume 52, Issue 4, Page 2152-2186, December 2025.
Abstract A general approach for extending estimators to matrix‐ and tensor‐valued data is proposed. The extension is based on using random projections to project out dimensions of a tensor and then computing a multivariate estimator for each projection. The mean of the obtained set of estimates is used as the final, joint estimate. In some basic cases,
Joni Virta, Stanislav Nagy, Klaus Nordhausen   +2 more
wiley   +1 more source

S-Matrix of Nonlocal Scalar Quantum Field Theory in Basis Functions Representation

Particles, 2019
Nonlocal quantum theory of a one-component scalar field in D-dimensional Euclidean spacetime is studied in representations of S -matrix theory for both polynomial and nonpolynomial interaction Lagrangians.
Ivan V. Chebotarev, Vladislav A. Guskov, Stanislav L. Ogarkov, Matthew Bernard   +3 more
doaj   +1 more source

Heat Transfer in n‐Dimensional Parallelepipeds Under Zero Dirichlet Conditions

Engineering Reports, Volume 7, Issue 10, October 2025.
The graphical abstract visually summarizes the analytical study of heat propagation in an n‐dimensional domain: Top Left: Shows a unit cube transformed into a parallelepiped via an affine transformation, representing the geometric generalization of the domain.
Zafar Duman Abbasov, Davron Aslonqulovich Juraev, Obidjon Khayrullaevich Abdullaev, Irfan Nurhidayat, Mohd Asif Shah   +4 more
wiley   +1 more source

The accuracy of approximation function of two real variables of non-classical Newtonian majorant

, 2014
Розглянуто питання точності наближення двох дійсних змінних некласичною мажорантою Ньютона.In the article is suggested the question of the accuracy of approximation function of two real variables of non-classical Newtonian ...
Глебена, Мирослава Іванівна
core  

Subharmonic functions and associated measures in ℝn

Open Mathematics
For subharmonic functions ss in Rn,n≥2,{{\mathbb{R}}}^{n},n\ge 2, there is an associated Radon measure μ\mu that is used to represent ss locally as an integral up to an additive harmonic function. We prove that the total measure μ(R2)\mu ({{\mathbb{R}}}^
Bajunaid Ibtesam
doaj   +1 more source

Mixed orthogonality graphs for continuous‐time state space models and orthogonal projections

Journal of Time Series Analysis, Volume 46, Issue 4, Page 692-726, July 2025.
In this article, we derive (local) orthogonality graphs for the popular continuous‐time state space models, including in particular multivariate continuous‐time ARMA (MCARMA) processes. In these (local) orthogonality graphs, vertices represent the components of the process, directed edges between the vertices indicate causal influences and undirected ...
Vicky Fasen‐Hartmann, Lea Schenk
wiley   +1 more source

Temperature majorant cross sections in Monte Carlo neutron tracking

, 2015
This paper discusses the generation of temperature majorant cross sections, the type of cross sections required by two separate techniques related to Monte Carlo neutron tracking, namely, the Dopplerbroadening rejection correction (DBRC) and target ...
Viitanen, Tuomas, Leppänen, Jaakko; id_orcid   +1 more
core   +1 more source

Improved Gevrey‐1 Estimates of Formal Series Expansions of Center Manifolds

Studies in Applied Mathematics, Volume 154, Issue 6, June 2025.
ABSTRACT In this paper, we show that the coefficients ϕn$\phi _n$ of the formal series expansions ∑n=1∞ϕnxn∈xC[[x]]$\sum _{n=1}^\infty \phi _n x^n\in x\mathbb {C}[[x]]$ of center manifolds of planar analytic saddle‐nodes grow like Γ(n+a)$\Gamma (n+a)$ (after rescaling x$x$) as n→∞$n\rightarrow \infty$.
Kristian Uldall Kristiansen
wiley   +1 more source

On the Hardy-Littlewood majorant problem

, 2003
Consider a trigonometric polynomial f of degree N, and associate to it the polynomial F in which each coefficient of f is replaced by its absolute value. F is called the majorant of f.
Ruzsa, I, Ruzsa, IZ, Green, BJ, Green, B
core   +1 more source

Solvability of a system of totally characteristic equations related to Kahler metrics

Electronic Journal of Differential Equations, 2017
We consider a system of equations composed of a higher order singular partial differential equation of totally characteristic type and several higher order non-Kowalevskian linear equations. This system is a higher order version of a system that arose
Jose Ernie C. Lope, Mark Philip F. Ona
doaj