Results 261 to 270 of about 2,067,545 (283)

Weighted Matchings for Preconditioning Symmetric Indefinite Linear Systems

SIAM Journal on Scientific Computing, 2006
Maximum weight matchings have become an important tool for solving highly indefinite unsymmetric linear systems, especially in direct solvers. In this study we investigate the benefit of reorderings and scalings based on symmetrized maximum weight matchings as a preprocessing step for incomplete $\mathrm{LDL^T}$ factorizations.
Michael Hagemann, Olaf Schenk
openaire   +1 more source

Eigenvalues of the p(x)-biharmonic operator with indefinite weight

Zeitschrift für angewandte Mathematik und Physik, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Ge, Bin, Zhou, Qing-Mei, Wu, Yu-Hu
openaire   +2 more sources

A Novel Indefinite Kernel Dimensionality Reduction Algorithm: Weighted Generalized Indefinite Kernel Discriminant Analysis

Neural Processing Letters, 2013
Kernel methods are becoming increasingly popular for many real-world learning problems. And these methods for data analysis are frequently considered to be restricted to positive definite kernels. In practice, however, indefinite kernels arise and demand application in pattern analysis.
Jing Yang, Liya Fan
openaire   +1 more source

Resonant nonlinear Neumann problems with indefinite weight

ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, 2012
We consider nonlinear Neumann problems driven by the p-Laplacian plus an indefinite potential. First we develop the spectral properties of such differential operators. Subsequently, using these spectral properties and variational methods based on critical point theory, truncation techniques and Morse theory, we prove existence and multiplicity theorems
MUGNAI, Dimitri, N. S. Papageorgiou
openaire   +5 more sources

Sturm–Liouville problems with indefinite weights and Everitt's inequality

Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 1996
It is shown that spectral properties of Sturm–Liouville eigenvalue problems with indefinite weights are related to integral inequalities studied by Everitt. A result of Beals on indefinite problems leads to a sufficient condition for the validity of such an inequality.
openaire   +1 more source

A weighting method for 0–1 indefinite quadratic bilevel programming

Operational Research, 2010
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
S. R. Arora, Ritu Arora
openaire   +3 more sources

Elliptic Problems Involving an Indefinite Weight Function

1996
We consider an elliptic boundary value problem defined on a region Ω ⊂ ℝn and involving an indefinite weight function ω. We also suppose that the problem under consideration admits a variational formulation. Then by appealing to the theory of selfadjoint operators acting in a Krein space, we derive various spectral properties for the problem.
M. Faierman, H. Langer
openaire   +1 more source

Positive Solutions for Third-Order Boundary Value Problems with Indefinite Weight

Mediterranean Journal of Mathematics, 2023
Sanyang Liu
exaly  

Existence and multiplicity of positive solutions of a nonlinear eigenvalue problem with indefinite weight function

Applied Mathematics and Computation, 2009
Xiaoling Han, Ruyun Ma
exaly  

Indefinite weight nonlinear problems with Neumann boundary conditions

Journal of Mathematical Analysis and Applications, 2017
Fabio Zanolin, Elisa Sovrano
exaly