Results 71 to 80 of about 500,170 (139)

A first-order spectral phase transition in a class of periodically modulated Hermitian Jacobi matrices [PDF]

Opuscula Mathematica, 2008
We consider self-adjoint unbounded Jacobi matrices with diagonal \(q_n = b_{n}n\) and off-diagonal entries \(\lambda_n = n\), where \(b_{n}\) is a \(2\)-periodical sequence of real numbers. The parameter space is decomposed into several separate regions,
Irina Pchelintseva
doaj  

Stochastic Galerkin and Monte Carlo Methods for Parabolic Problems: Numerical Performance of Variational Matrix‐Free Approximations

Proceedings in Applied Mathematics and Mechanics, Volume 26, Issue 4, December 2026.
ABSTRACT Stochastic Galerkin methods offer unexplored potential for the numerical simulation of parabolic problems with random variables, in particular if they are combined with variational discretizations of the space and time variables. Due to the high dimensionality, the solution of the arising algebraic systems do not become feasible without ...
Moataz Dawor, Nils Margenberg, Markus Bause   +2 more
wiley   +1 more source

The eigenvalue density of rational Jacobi matrices. II

, 1980
The determination of level-average properties (e.g. the level density) of physical systems often reduces to the calculation of spectral-average properties of the rational Jacobi matrices, i.e.
S.-Dehesa, Jesus
core   +1 more source

On classical orthogonal polynomials and the Cholesky factorization of a class of Hankel matrices

Bulletin of Mathematical Sciences
Classical moment functionals (Hermite, Laguerre, Jacobi, Bessel) can be characterized as those linear functionals whose moments satisfy a second-order linear recurrence relation.
Misael E. Marriaga, Guillermo Vera de Salas, Marta Latorre, Rubén Muñoz Alcázar   +3 more
doaj   +1 more source

Environmental Sustainability of Soybean Production in the Democratic Republic of Congo: Cases of Production Systems in the South‐Kivu and Kasaï‐Lomami Provinces

Journal of Sustainable Agriculture and Environment, Volume 5, Issue 4, December 2026.
Small versus large scale soybean production systems' footprints. ABSTRACT Soybean is increasingly grown in the Democratic Republic of the Congo (DRC), produced mainly in small‐scale systems and supplied locally for human consumption. Prospects of large‐scale expansion and intensification, with potential environmental drawbacks, loom and call for a ...
Réussite Bugale Malembaka, Stephan Pfister, Braida Thom, Kokou Kintche, Johanna Jacobi   +4 more
wiley   +1 more source

Exhibiting AI images: Unexpected outputs, linguistic inequalities, and curatorial possibilities

Anthropology and Humanism, Volume 51, Issue 2, December 2026.
Abstract Structured around latent data spaces that store masses of semantic associations, AI image generators have an intrinsic capacity to draw connections their users might not expect. Their outputs thus have the potential to engender characteristically anthropological epistemic shifts: subverting pernicious stereotypes, opening up horizons of ...
Nicholas J. Long
wiley   +1 more source

Rational points on even‐dimensional Fermat cubics

Transactions of the London Mathematical Society, Volume 13, Issue 1, December 2026.
Abstract We show that even‐dimensional Fermat cubic hypersurfaces are rational over any field of characteristic not equal to three, by constructing explicit rational parameterizations with polynomials of low degree. As a byproduct of our rationality constructions, we obtain estimates for the number of their rational points over a number field and ...
Alex Massarenti
wiley   +1 more source

A Geometric Multigrid Preconditioner for Discontinuous Galerkin Shifted Boundary Method

International Journal for Numerical Methods in Engineering, Volume 127, Issue 21, 15 November 2026.
ABSTRACT I introduce a geometric multigrid preconditioner for the Shifted Boundary Method (SBM) designed to solve PDEs on complex geometries. While the SBM simplifies mesh generation by using a nonconforming background grid, it often results in nonsymmetric linear systems, a complete analysis of which is missing from the literature, especially with ...
Michał Wichrowski
wiley   +1 more source

Numerical Solutions of Odd Order Linear and Nonlinear Initial Value Problems Using a Shifted Jacobi Spectral Approximations

Abstract and Applied Analysis, 2012
A shifted Jacobi Galerkin method is introduced to get a direct solution technique for solving the third- and fifth-order differential equations with constant coefficients subject to initial conditions.
A. H. Bhrawy, M. A. Alghamdi
doaj   +1 more source

Direct Spectral Problem for the Generalized Jacobi Hermitian Matrices [PDF]

, 2009
In this article we will introduce and investigate some generalized Jacobi matrices. These matrices have three-diagonal block structure and they are Hermitian.
Ivasiuk, I.Ya
core   +1 more source